La Parguera Bio Bay: Swimming Rules, Tours and Prices
La Parguera in Lajas is the one Puerto Rico bio bay where licensed tours let you swim. What the rules say, every operator and price, the full-moon closure and where to stay.
At 7:30 p.m. the La Parguera waterfront smells of grilled pinchos and boat fuel, and a reggaetón speaker is competing with a salsa one. Twenty minutes later you are in black water in a mangrove-lined bay, and every kick sends sparks off your legs. This is Bahía Fosforescente in Lajas, the least famous of Puerto Rico’s three bioluminescent bays. It is dimmer than Mosquito Bay and busier than Laguna Grande, and it is the only one of the three where licensed tours let you jump in.
You can swim here in practice: operators run swim tours every night the bay is open, and Puerto Rico’s official tourism site says swimming is “permitted on most nights.” The legal basis is less clear, because one operator says a 2023 order bans it and the order itself has never been published. This guide covers what that means for your booking, what each tour costs and how to pick a night when the water glows.
Check Availability
Quick answer: swimming, prices and the full-moon closure
- Where: Bahía Fosforescente (and neighbouring Bahía Monsio José), east of La Parguera village, Lajas, on Puerto Rico’s southwest coast.
- Can you swim? Yes, on licensed swim tours, which run nightly. Parguera Eco Tours ($45), Parguera Water Sports ($68–$100), Hook’d on Adventure ($70), Paradise Scuba ($70–$100) and Caribbean Breeze ($54.99) all sell them. One water-bike operator, Caribbean Chiliboats, says DRNA Administrative Order 2023-02 and Regulation 8013 ban swimming. All 2023 press coverage of the order describes only a three-night full-moon closure and a crackdown on unpermitted motorboats, and Regulation 8013 (April 6, 2011) is a general rule for licensing tour concessions in protected areas. We found nothing in either that bans swimming, but we could not read the full text of either one.
- Cost: about $45–$100 per person from the La Parguera waterfront; $145–$250 for a day trip from San Juan; private boats $350–$750 or more.
- Time: tours last 1–3 hours. The drive is about 2–2.5 hours from San Juan and about 1 hour from Rincón.
- Closed: three nights around each full moon under DRNA Administrative Order 2023-02 (June 2023). We found no 2024–2026 news on enforcement, so confirm with your operator.
- Glow: real, but fainter than Mosquito Bay. Swimming, a dark night and a small boat or kayak make the biggest difference. Wet-season months, a new moon and weeknights give you the best odds.
- Best for: swimmers, families with confident kids, and anyone staying on the west or south coast.
The tour we put in the booking box is Mareaito Charters' La Parguera: Sunset and Biobay or Late Night Biobay Cruise ($65, 4.8/5 from 580 reviews), the most-reviewed La Parguera trip on GetYourGuide. If you want to compare it with the other bays first, our La Parguera bio bay tours page lists the three trips you can book online side by side.
What is La Parguera Bio Bay?
La Parguera Bio Bay is the common name for Bahía Fosforescente (“phosphorescent bay”), a shallow, mangrove-fringed bay just east of the fishing village of La Parguera in Lajas. Microscopic dinoflagellates there flash blue-green when the water is disturbed. It is one of Puerto Rico’s three bioluminescent bays, along with Mosquito Bay in Vieques and Laguna Grande in Fajardo.
The bay sits inside the Reserva Natural de La Parguera, which DRNA manages. Wikipedia’s summary of the reserve’s designation gives an establishment date of September 20, 1979 and an area of 652.03 cuerdas (633.27 acres). Some operator pages describe a much larger “12,000-acre” mangrove system, which probably counts the wider coastal forest; treat that figure as unverified. The reserve also covers the cays offshore, including Isla Mata la Gata, Cayo Caracoles, Cayo Media Luna, Cayo Laurel, Cayo Turrumote and Isla Magueyes. Magueyes is home to UPR-Mayagüez’s Department of Marine Sciences.
Bahía Fosforescente vs. Bahía Monsio José: one bay or two?
There are two. In Spanish, the Municipality of Lajas’s tourism page says: “En la región de La Parguera encontramos dos bahías resguardadas que exhiben este fenómeno… las aguas de la Bahía Fosforescente y la Bahía Monsio José brillan cuando son agitadas.” (“In the La Parguera region we find two sheltered bays that show this phenomenon… the waters of Bahía Fosforescente and Bahía Monsio José glow when agitated.”) Puerto Rico’s EcoExploratorio science museum counts four recurring bioluminescent bodies of water in Puerto Rico, listing “Laguna Monsio José-Lajas” separately.
Lonely Planet says boats visit “Bahía Monsio José and Bahía La Parguera, east of town,” both reached through narrow mangrove canals. Reviews of Parguera Water Sports describe captains sending kayakers down a specific mangrove channel for the brightest glow. We could not confirm which bay any particular swim tour uses: no official source says swim tours are limited to Monsio José, and operators simply say “the Bio Bay.” If it matters to you, ask your captain which bay you’ll be in.
Can you swim in La Parguera Bio Bay? The evidence (October 2026)
Yes in practice, uncertain on paper. Licensed operators sell swim tours every night the bay is open, and nobody has published a rule that clearly bans swimming. Here is the evidence, by date and source:
| Source (date) | What it says | Our read |
|---|---|---|
| WIPR / Notiséis, Primera Hora, Victoria 840 (June 8, 2023), covering DRNA AO 2023-02 | Three-night full-moon closure; the problem is “personas que visitan la Bahía sin los permisos necesarios e ilegalmente utilizan embarcaciones de motor” (“people who visit the Bay without the necessary permits and illegally use motorboats”) | No mention of swimming (“nadar,” “bañistas,” “natación”) anywhere in the coverage |
| DRNA Regulation 8013 (April 6, 2011) | “Reglamento para la Administración de los aprovechamientos Mediante Autorización y Concesión en Áreas Naturales Protegidas,” the general framework for licensing tour concessions in protected areas | Not bio-bay-specific. We could not read the full text to check for a swim clause. |
| Caribbean Chiliboats listings (GetYourGuide/TripAdvisor, 2026) | “Swimming is not allowed by law under regulations of the… DRNA, including Administrative Order 2023-02”; also cites “Regulation 8013” | The only operator claiming a ban. It doesn’t quote the provision. |
| Discover Puerto Rico profile (2026) | “the only one where swimming in the bioluminescent water is permitted on most nights”; “Swimming is not guaranteed to be available every night” | Puerto Rico’s official tourism site says swimming is allowed |
| Discover Puerto Rico bio bay guide (updated Aug 25, 2026) | Mentions “a kayak tour, boat ride, or even a night swim” | Matches the profile. An earlier “no swimming in any bay” FAQ line was not in the version we reviewed. |
| Parguera Eco Tours, Parguera Water Sports, Hook’d on Adventure, Paradise Scuba, Caribbean Breeze, Joy Tours (2025–2026) | All sell swim tours openly. Paradise Scuba says it is “endorsed by the Puerto Rico Tourism Company and the Department of Natural Resources (DRNA).” | Established, licensed businesses operating in plain sight |
| El Nuevo Día (Feb 7, 2026) | A DRNA patrol in La Parguera wrote 16 tickets for navigation violations, mainly safety gear and registration stickers | The only recent enforcement news we found. Nothing on swimming. |
How sure are we? Highly confident that licensed swim tours operate openly in 2026. Medium confidence that no published DRNA rule bans swimming. Low confidence about what the unpublished text of AO 2023-02 says: we searched drna.pr.gov and the Spanish-language press and could not find the order itself. The rules could also change. On March 27, 2024 DRNA posted a “Request for Proposals: Developing an Ecosystem-Based Management Approach for La Parguera Natural Reserve Management Plan,” with proposals due April 10, 2024, and Primera Hora reported (April 3, 2024) that Secretary Anaís Rodríguez Vega announced it under DRNA’s coral reef conservation program.
What to do about it:
- Book swims only with established operators that hold DRNA or Puerto Rico Tourism Company credentials. Don’t jump off random boats.
- Skip sunscreen, bug spray, perfume and hair products before you swim. Several operators ask for this, and it is the most defensible reason anyone gives for limiting swimming.
- If you’d rather not swim, Chiliboats’ water bikes, glass-bottom boats and kayak-only tours keep you dry.
The science behind the glow, and the swim rules at all three bays, are in our guide to why bio bays glow and whether you can swim.
How bright is La Parguera Bio Bay?
Dimmer than Mosquito Bay, and very dependent on the night. On a dark, wet-season new moon it can be magical. On a bright night from a big boat it can disappoint. Reviewers say the same thing in different words:
- “The lights was there for sure, but somewhat fainter than I was expecting” (TripAdvisor reviewer).
- “It was not at all bright the night we went out on the large boat… Smaller boats can go deeper into the bay” (Puerto Rico Day Trips, updated Nov 3, 2025).
- “We picked a night with a new moon so it was very dark and the bioluminescent water really glowed a whitish blue” (TripAdvisor, February 2025, with Johnny’s Boats).
- “Fish shot through the water looking like comets. Sparkles ran down our legs” (TripAdvisor, March 2024, with Parguera Water Sports, kayak plus swim).
Why it dimmed: Lonely Planet says “the environmental impact of boat tours and developments has dimmed the spectacular show.” Research from UPR-Mayagüez gives a fuller picture:
- Soler-Figueroa & Otero (2016, Journal of Experimental Marine Biology and Ecology) measured “bioluminescence potential” in the bay systematically for the first time since Clarke & Breslau in 1960. They found the highest glow in the wet season, tightly correlated with Pyrodinium bahamense cell density (r = 0.89, n = 64), and dim periods that line up with blooms of the non-glowing Ceratium furca. The same paper cites reports of “drastic reduction or disappearance of bioluminescence… due to dredging at the entrance.”
- Soler-Figueroa & Otero (2015, Estuaries and Coasts) linked swings between the two species to rainfall and nutrient runoff.
- A UPR-Mayagüez M.S. thesis (Soler-Figueroa, 2006) reported an annual average of 50,618 P. bahamense cells per litre in La Parguera’s bay, against 286,411 per litre in Vieques’s Puerto Mosquito, about a sixth as many, and found C. furca “dominated over P. bahamense part of the year.”
- García Troche & Morell (PLOS ONE, reported by UPR-Mayagüez in May 2021) found the bay’s pH averages 7.6, lower than nearby ocean water about 80% of the year.
What we couldn’t verify: On Hurricane María (2017), the Latz Laboratory at UC San Diego’s Scripps Institution of Oceanography posted on October 30, 2017 that “Three of the four bioluminescent bays went dark after Maria… Phosphorescent Bay in La Parguera was largely spared.” That is a lab blog post, not peer-reviewed data. We found no data on how Hurricane Fiona (2022) or the 2020 southwest earthquakes affected La Parguera.
How to get the brightest night:
- Swim or snorkel. Your whole body stirs the water. Paradise Scuba hands out masks so you can watch the sparks underwater.
- Go small. A six-passenger boat (Hook’d on Adventure) or a kayak gets into darker corners than a glass-bottom boat carrying 100 or more.
- Book a late or post-sunset slot on a moonless night. Avoid the week around the full moon even when the bay is open.
- Aim for August–November. That is the wet season, when the UPR data showed the highest glow.
Moon phases and month-by-month odds for all three bays are in our best time to see the bioluminescent bay guide.
Is La Parguera Bio Bay closed on the full moon?
Yes, at least on paper. DRNA Administrative Order 2023-02, signed by Secretary Anaís Rodríguez Vega and effective immediately in June 2023, ordered “el cierre temporal de la Bahía durante tres días de luna llena en cada ciclo lunar” (“the temporary closure of the Bay for three days of full moon in each lunar cycle”), as Primera Hora reported on June 8, 2023. Operators and Puerto Rico Day Trips (updated November 2025) read that as the night before, the night of and the night after each full moon.
We found no 2024–2026 news confirming enforcement or changes. Check the moon calendar and confirm with your operator before you drive across the island.
La Parguera bio bay tours: which type should you book?
For most people, a small-boat swim tour. It is the cheapest way to get the best version of this bay. Kayak-plus-swim suits you better if you want exercise and darker channels.
Boat-and-swim tours (most popular)
A 15–25-minute motorboat ride to the bay, a short talk, then 15–60 minutes in the water with life jackets (and sometimes snorkel masks). Prices run from $45 to $70. Time in the water varies: Caribbean Breeze lists 20 minutes, Joy Tours 15–20, Parguera Eco Tours 30, and Hook’d on Adventure “up to an hour.”
Two boat tours sell on GetYourGuide. Mareaito Charters' sunset and bio bay cruise ($65, 4.8/5 from 580 reviews) runs about two hours, with a sunset stop on the cays before the bay or a later bay-only departure. Joy Tours' La Parguera: Bioluminescent Bay Boat Tour ($60, 4.6/5 from 296 reviews) is the shorter one-hour trip with an optional swim.
Kayak tours and kayak-plus-swim
- Parguera Water Sports motors you out, puts you in kayaks for the mangrove channels, then lets you swim. One March 2024 reviewer kayaked 30 minutes and swam another 30.
- Kayaking Parguera is the only all-paddle option we found: Hobie pedal kayaks or traditional kayaks, about 3 miles round trip, certified by DRNA and the Puerto Rico Tourism Company. One reviewer called it “the only tour… where you do everything with the kayak… you have to be fit!”
Neither sells on GetYourGuide or Viator; book them directly. Our bio bay kayak tours guide compares paddling at all three bays, and clear kayak vs. kayak vs. electric boat compares the formats.
Water bikes (no swim)
Caribbean Chiliboats runs pedal catamarans from Punta Papayo: about 25 minutes of pedalling each way and about 30 minutes in the bay, 1.5–2 hours in total. They are stable, quiet and low-impact, a good fit for non-swimmers. Ages 10–75, with height and weight limits (see the table). Book the La Parguera: Bioluminescent Bay Water Bike Tour ($79, 4.8/5 from 106 reviews).
Glass-bottom boats (budget, big groups)
Fondo de Cristal III (787-899-5891) runs the classic big boat from the malecón. One blogger estimated it holds about 150 people, with four viewing ports. A crew member dives in so you can see the glow. It is cheap and fine with small kids, but reviewers complain the “glass bottom” is just small panels and the glow is weak from a big boat. Lonely Planet calls it “the least expensive way to witness this glowing water.”
Walk-up dock boats on the malecón
At night, touts on the waterfront sell 45–60-minute rides on small boats. Undated or older reviews mention $10–$25 per person, and prices have almost certainly gone up. Some are established family businesses, such as Johnny’s Boats, which earned good 2025 reviews. There is a risk, though: DRNA’s 2023 order exists partly because of “personas que… ilegalmente utilizan embarcaciones de motor.” Ask to see a DRNA concession or Tourism Company endorsement, and make sure there are life jackets for everyone.
Tours from San Juan
Expect 8–9 hours door to door and about 2 hours 15 minutes of driving each way. Most include a stop in the village and a sunset cruise. These suit visitors without a car; otherwise, a rental car plus a local tour costs roughly half as much. The two with the most reviews on GetYourGuide are Bespoke’s From San Juan: La Parguera Glowing Bio Bay Boat Tour ($199, 4.8/5 from 116 reviews) and Borikua Tours' From San Juan: Bio Bay Magic & Rum Tasting Tour ($250, 4.8/5 from 212 reviews), which adds a rum tasting at Castillo Serrallés in Ponce on the way. The cheapest is Caribbean Breeze’s La Parguera Bio Bay Boat Ride and Swimming w/ San Juan Transport (from $144.99 on its own site; 3.9/5 from 719 Viator reviews, several of them about late returns). Every pickup option from the city is in our guide to bio bay tours from San Juan, and other day trips from the capital are in our best excursions and day trips from San Juan.
La Parguera bio bay operators compared (2026 prices)
Prices are as listed on operator sites or booking platforms in 2025–2026. They change by season, so check before booking.
| Operator | Tour | Price (adult) | Duration | Swim? | Ages / limits | Group size | Departs | Notes | Book online |
|---|---|---|---|---|---|---|---|---|---|
| Mareaito Charters | Sunset & bio bay, or late-night bay | $65 | 2 hrs | Yes | — | — | La Parguera | Most-reviewed La Parguera listing on GetYourGuide | Sunset and Biobay Cruise (4.8/5, 580 reviews) |
| Parguera Eco Tours | Boat & swim | $45 | about 1 hr (30 min in water) | Yes | Not stated | Not stated | La Parguera | Cheapest swim. One page of its site says “average time is an hour” in the water, which conflicts with the 30 minutes stated elsewhere. 787-709-2384 | Direct only |
| Parguera Water Sports | Swim & kayak | $78 (ages 4+); $33 (3 and under); private from $125 | 2–2.5 hrs | Yes | All ages | Groups of 15+ call ahead | La Parguera | An older tours page shows $75. USCG-certified vessels and captains. | Direct only |
| Parguera Water Sports | Sunset swim + kayak | $100 | 3 hrs | Yes | All ages | — | La Parguera | Sunset at a cay, then the bay | Direct only |
| Parguera Water Sports | Swimming Biobay Adventure | $68 | 1.5 hrs | Yes | All ages | — | La Parguera | Boat + swim | Direct only |
| Hook’d on Adventure | Bio bay 1-hour | $70; $55 (3 and under) | 1 hr | Yes (up to 1 hr per FAQ) | All ages | 6 per boat | Carmen’s Shell Shop, main square | Smallest groups | Direct only |
| Hook’d on Adventure | Sunset + swim | from $70 | 2 hrs | Yes | All ages | 6 per boat | Same | Stops at Mata la Gata or Caracoles at sunset | Direct only |
| Hook’d on Adventure | Private evening / day + bio bay | $550 (4 hrs) / $750 (6 hrs) | 4–6 hrs | Yes | All ages | 6 per boat | Same | The splurge option | Direct only |
| Paradise Scuba & Snorkeling | Bio Bay Tour | $70 | about 1.5–2 hrs (est.) | Yes (snorkel) | — | — | Road 304 km 3.2 | Check-in 6:00 p.m. Dec–Feb, 6:30 p.m. otherwise | Direct only |
| Paradise Scuba & Snorkeling | Sunset snorkel + bio bay | $100 (6+); $55 (5 and under) | 4 hrs, 4:00 p.m. start | Yes | 6+ at adult rate | — | Same | Empanadillas, beer and soda included | Direct only |
| Caribbean Chiliboats | Water bike | $79 (GetYourGuide); from $69 (own site) | 1.5–2 hrs | No | Ages 10–75; height 54"–6'5" (one listing says 48" for kids 10+); 240 lb per person, 450 lb per bike | 20–24 max | Punta Papayo | Says swimming is banned under AO 2023-02 | Bioluminescent Bay Water Bike Tour (4.8/5, 106 reviews) |
| Kayaking Parguera | Bio bay kayak (Hobie/traditional) | Not verified (day tours $30–$50) | about 2–3 hrs | Reviewers suggest bringing swimwear | Fitness needed | — | La Parguera | About 3 miles of paddling; DRNA/PRTC certified | Direct only |
| Fondo de Cristal III | Glass-bottom boat | about $25 (older review; verify) | about 1 hr | Crew swims; guests vary | All ages | Large (est. about 150) | Malecón | Budget pick; dimmest experience | Direct only |
| Joy Tours PR | Boat + swim | $60 (GetYourGuide); $65 direct | 1 hr (15–20 min swim) | Yes (optional) | — | Small group | La Parguera | Bioluminescent Bay Boat Tour (4.7/5, 296 reviews) | |
| Caribbean Breeze Adventures | Boat & swim (self-drive or from San Juan) | $54.99 self-drive; $144.99 with San Juan transport (Groupon shows $159.99) | 1 hr boat; 9 hrs from San Juan | Yes (20 min) | All guests pay for a seat (“head count is monitored by the DRNA”) | — | 7:15/8:15 p.m. boats; San Juan pickup from 2 p.m. | TripAdvisor 3.9 across about 298 reviews; late returns mentioned | Bio Bay Boat Ride with San Juan Transport (Viator, 3.9/5, 719 reviews) |
| Bespoke Lifestyle Mgmt. | From San Juan, sunset + bio bay | $199 (GetYourGuide); $210–$220 (Expedia/TripAdvisor) | 9 hrs | Yes | Kids ≥50 lb | Max 13 | Old San Juan (Plaza Colón) | One 2026 review complained of a return after 1 a.m. | La Parguera Glowing Bio Bay Boat Tour (4.8/5, 116 reviews) |
| Borikua Tours | From San Juan + rum tasting in Ponce | $250 | Full day and evening | Yes | — | — | San Juan | Castillo Serrallés rum tasting on the way | Bio Bay Magic & Rum Tasting Tour (4.8/5, 212 reviews) |
| Rincon Vacations | Kayak bio bay | $67 ($25 for 3 and under) | 2 hrs | — | — | — | La Parguera (no transport) | Also a 9-hr Hot Spring + Bio Bay trip from the west for $225 | Direct only |
Every operator in all three bays is scored in our best bio bay tours compared guide.
Our picks:
- Best overall: Hook’d on Adventure’s sunset + swim. Six people per boat, a long swim and a sunset at the cays for about $70. Book it directly.
- Best to book online: Mareaito’s sunset and bio bay cruise at $65, with the most reviews of any La Parguera listing.
- Best budget swim: Parguera Eco Tours at $45.
- Best active option: Parguera Water Sports’ kayak + swim ($78), or Kayaking Parguera if you’re fit.
- Best no-swim option: the Chiliboats water bike tour ($79).
- Best with snorkelling: Paradise Scuba’s sunset snorkel + bio bay ($100).
- No car: Caribbean Breeze is cheapest, but read recent reviews; Bespoke is smaller and costs about $55 more.
How do you get to La Parguera?
Drive. La Parguera is on PR-304 in Lajas, at the southwest corner of the island, and there’s no practical public transport. Typical drive times, taken from Caribbean Chiliboats’ listing unless noted:
| From | Drive time |
|---|---|
| San Juan | 2 hr 15 min (Discover Puerto Rico says 2–2.5 hrs) |
| Ponce | 50 min |
| Cabo Rojo | 35 min |
| Rincón | 1 hr 10 min (Discover Puerto Rico says about 1 hr) |
| Aguadilla (BQN airport) | 1 hr 15 min |
Near Rincón, Cabo Rojo or Ponce? La Parguera is the closest bio bay to all three, so it is the obvious choice if you’re looking for a bioluminescent bay near Rincón, Cabo Rojo or Ponce.
Parking: expect street parking and small paid lots around the malecón and the main square. They fill up on weekends. Arrive 30–45 minutes early, which is also when most operators start check-in.
Where should you stay and eat?
Stay: in the village, options include the adults-only Parguera Plaza Hotel, Parador Villa Parguera and Parguera Beach Club, plus apartments and vacation rentals (all stays in La Parguera). Some rentals near the water advertise easy access to Cayo Caracoles. Staying overnight saves you a night drive of two hours or more. Quieter alternatives are 20–40 minutes away in Boquerón and Cabo Rojo. Prices, parking charges and drive times for the village hotels are on our where-to-stay page.
Eat: the malecón is lined with kiosks selling pinchos, alcapurrias and empanadillas, plus seafood restaurants. Reviewers often recommend Restaurante El Karacol, Violeta’s and Los Balcones D’Corales. Eat before a 7 p.m. tour, because most don’t include dinner (Paradise Scuba’s empanadillas are the exception).
Weekends: on Friday and Saturday nights La Parguera turns into a local party town, with loud music, packed streets and lots of boat traffic. If you want calm water and a darker bay, book Sunday through Thursday.
What else is there to do in La Parguera?
La Parguera is also one of Puerto Rico’s best snorkel and dive bases, so plan a full day.
- Snorkel the cays: Cayo Caracoles and Mata la Gata are the classics. Paradise Scuba runs a 2.5-hour reef snorkel for $70 at 9 a.m. and 12 p.m. Kayaking Parguera ($30–$50) and Chiliboats offer self-powered trips out to the cays; Chiliboats’ is the La Parguera: Water Bike Tour in La Parguera Cays ($85, 4.9/5 from 20 reviews, a small sample).
- Dive La Pared (“The Wall”): Paradise Scuba describes it as a 1,500-foot reef shelf about 20 minutes offshore. Wall dives cost from $130.
- Mangrove kayaking: paddle the channels by day to see the same ecosystem that feeds the glow. Our mangrove kayaking in Puerto Rico guide covers the La Parguera tours and rentals.
- Within a short drive (confirm hours before you go): Gilligan’s Island and the Guánica Dry Forest to the east; the Cabo Rojo salt flats, Playa Sucia and Los Morrillos Lighthouse to the west; Boquerón’s beach and bar scene to the northwest.
La Parguera vs. Laguna Grande vs. Mosquito Bay
| La Parguera (Lajas) | Laguna Grande (Fajardo) | Mosquito Bay (Vieques) | |
|---|---|---|---|
| Brightness | Lowest, variable | Medium | Brightest (Guinness World Records, 2006) |
| Swimming | Offered by licensed tours (status debated) | No | No |
| Motorboats | Yes (the only bay that allows them) | No (kayak) | No (kayak/electric) |
| From San Juan | about 2–2.5 hrs drive | about 1 hr 15 min drive | Flight (about 25 min) or ferry from Ceiba (about 45 min) + drive |
| Typical price | $45–$100 | about $59–$105 | about $55–$112 |
| Best for | Swimmers, west/south-coast stays, families | Short trips from San Juan | The brightest glow |
Our guide to Puerto Rico’s bioluminescent bays covers all three; for the other two in depth, see Laguna Grande, Fajardo, Mosquito Bay, Vieques and how to get to Vieques.
Is La Parguera Bio Bay worth it?
Yes if you’re on the west or south coast or you want to swim. Probably not as a day trip from San Juan just to see the glow. If brightness is what you want, take the ferry to Vieques. If you’re short on time, go to Fajardo. La Parguera wins on being in the water, and on pairing the night with a day of snorkelling the cays. For many people, swimming through faint blue sparks under a sky full of stars beats watching brighter water from a kayak.
What to bring
- Swimsuit worn under your clothes, a towel and a dry change of clothes
- Water shoes or sandals
- Cash for tips and malecón food
- A dry bag for your phone (phones struggle to capture the glow; leave the flash off)
- Biodegradable repellent or none, and no sunscreen if you’re swimming
- A light layer for the boat ride back
FAQ
Can you swim in La Parguera bio bay? Yes, on licensed swim tours. Parguera Eco Tours, Parguera Water Sports, Hook’d on Adventure and Paradise Scuba all run them nightly. One operator, Caribbean Chiliboats, says DRNA rules ban swimming, but we found no published rule that says so.
Is swimming in the bio bay legal? It’s tolerated and widely offered, but not clearly written into any rule we found. Press coverage of AO 2023-02 mentions only full-moon closures and illegal motorboats. Swim only with permitted operators.
How bright is La Parguera bio bay? It’s the dimmest of Puerto Rico’s three bio bays. It glows best on dark nights, especially in the wet season (August–November), and when you’re in the water or in a small boat.
How much does a La Parguera bio bay tour cost? About $45–$100 per person locally. Tours from San Juan run $145–$250, and private boats $350–$750 or more.
How long is the tour? Boat-and-swim tours last about 1 hour. Kayak tours run 2–2.5 hours, and sunset combos 2–4 hours. From San Juan, plan on 8–9 hours in total.
When is the best time to go? A moonless weeknight from August to November, after full dark. Avoid the full-moon week.
Is it closed on the full moon? Yes. DRNA Administrative Order 2023-02 (June 2023) closes the bay for three nights around each full moon. Confirm with your operator, because we found no 2024–2026 update.
Kayak or boat? A small boat with a swim gives the best glow for the money. Kayaks get you into darker mangrove channels and are quieter. Big glass-bottom boats are cheapest but dimmest.
How far is it from San Juan? About 2–2.5 hours by car, or 2 hours 15 minutes each way on organised tours.
Is it good for kids? Yes. Most swim tours accept all ages with life jackets. Paradise Scuba charges the adult rate from age 6, Chiliboats requires age 10 or older, and Bespoke requires kids to weigh at least 50 lb.
Are Bahía Fosforescente and La Parguera bio bay the same thing? Mostly, yes. “La Parguera bio bay” usually means Bahía Fosforescente. Nearby Bahía Monsio José also glows, and some tours may go there.
Can I go without a tour? Not legally by motorboat. DRNA requires permits and is cracking down on unpermitted motorboats. Book a licensed operator.
Ready to book? Compare the three online options on our La Parguera bio bay tours page, or check dates for our pick below.
See the Water Light Up
Paddle into Laguna Grande with the operator 275 guests rated 4.6/5 — small groups, a full safety briefing, and free cancellation up to 24 hours before.
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