The best bio bay in Puerto Rico is the one that fits your trip. Laguna Grande in Fajardo is the closest to San Juan and runs every night by kayak. Mosquito Bay suits guests staying on Vieques, seen from a clear-bottom kayak. La Parguera in Lajas is a sunset boat trip on the southwest coast on select nights each month. All three glow year-round, and a darker night shows it best.
Start with where you are staying. Each card is a real tour with its own price.
Best if you are staying in San Juan or on the east coast
Paddle a two-person kayak through a mangrove channel into the glowing lagoon. Runs every night, ages 6 and up, hotel pickup available.
From $85 per person
Contact Us to Book See the Fajardo tourBest if you are staying on Vieques
Glide across the bay in a two-person clear-bottom kayak, a short van ride from Esperanza. Ages 3 and up.
$85 per person
Contact Us to Book See the Vieques tourBest for a sunset boat ride on the southwest coast
Watch the sunset from the water at Caracoles island, then ride to the glowing lagoon. Select nights each month, no minimum age.
From $169 per person
Contact Us to Book See the La Parguera tourThe best bioluminescent bay in Puerto Rico for you depends on where the three bays are, how you see the glow and which nights the tours run. Laguna Grande in Fajardo is a kayak tour every night from $85. Mosquito Bay on Vieques is a clear-kayak tour for $85 when you stay on the island. La Parguera in Lajas is a sunset boat tour on select nights from $169.
| Bay | Best for | Getting there | How you see it | Ages | Nights | Price | Book |
|---|---|---|---|---|---|---|---|
| Laguna Grande, Fajardo | Staying in San Juan or on the east coast | About an hour, 50 to 90 minutes depending on traffic and where in San Juan you start, or hotel pickup | Two-person kayak through a mangrove channel, about 2 hours | 6 and up | Every night, all year | $85, or $145 with hotel pickup | Contact Us to Book |
| Mosquito Bay, Vieques | Staying on Vieques | Ferry from Ceiba or a short flight, then at least one night on Vieques | Two-person clear-bottom kayak, about 1.5 hours | 3 and up | The nights you stay on Vieques | $85 | Contact Us to Book |
| La Parguera, Lajas | A sunset boat ride on the southwest coast | About 2 to 2.5 hours each way, with courtesy transportation from San Juan | Boat ride to Caracoles island for sunset, then the lagoon after dark | Any age | Select nights each month | $169, or $199 with a Pig Route lunch stop (meal not included) and Ponce | Contact Us to Book |
Prices are per person for each tour. All three tours have free cancellation up to 24 hours before, and a full refund if we cancel for unsafe weather. For the full cost of the night, from tickets to transportation, see how much a bio bay tour costs.
The choice between the Fajardo and Vieques bio bays, Laguna Grande or Mosquito Bay, comes down to where you are sleeping, since both kayak tours are $85. Laguna Grande in Fajardo is about an hour from San Juan, runs every night and offers hotel pickup. Mosquito Bay is on the island of Vieques, and there is no same-day ferry back after the tour, so it suits guests staying there.
Planning the island part of the trip? Read how to get to the Vieques bio bay.
La Parguera in Lajas, on Puerto Rico's southwest coast, suits travelers who want a boat instead of a kayak and a sunset on the water before the glow. Our La Parguera tour has no minimum age and runs on select nights each month, in the stretch after the full moon. Fajardo suits a short trip from San Juan on any night, and Vieques suits guests staying on the island.
For the drive and the route, see La Parguera from San Juan.
Two of Puerto Rico's three bio bays are on the main island, so no ferry is needed: Laguna Grande in Fajardo on the east coast, and La Parguera in Lajas on the southwest coast, about 2 to 2.5 hours each way from San Juan. Mosquito Bay is on the island of Vieques. See all three on our map of Puerto Rico's bio bays.
Laguna Grande is the closest bio bay to San Juan; our guide to the bio bay from San Juan covers every way to get there.
Guinness World Records lists Mosquito Bay on Vieques as the brightest bioluminescent bay. On any given night, though, how strong the glow looks at all three bays changes with the moon, the weather and the water. A field study that sampled Laguna Grande from 2016 to 2021 found the glowing plankton rising and falling widely, so the darkness of your night matters most.
Sources: Guinness World Records; Govender and Jury, Revista de Biología Tropical, 2024. Find the darkest night of your trip on the bio bay moon calendar, and the months in our guide to the best time to see the bio bay.
Tonight's skySee the darkest nights on the moon calendarThe best bio bay tour for your trip depends on how you travel: with or without a car, with young kids, by kayak or by boat. Here is the quick match for each case, with the tour and its price. Every tour on this site is booked directly with Paradise Seekers Puerto Rico, on WhatsApp or by phone.
The best bioluminescent bay in Puerto Rico depends on where you are staying. Laguna Grande in Fajardo suits San Juan and east coast visitors and runs every night. Mosquito Bay suits guests staying on Vieques. La Parguera in Lajas suits travelers who want a sunset boat ride on the southwest coast on select nights.
Neither is better for everyone, because each suits a different trip. The Fajardo bio bay is the easy choice from San Juan, with nightly tours and hotel pickup. The Vieques bio bay suits guests sleeping on Vieques, since there is no same-day ferry back after the tour. Both kayak tours are $85 per person.
Puerto Rico's three bioluminescent bays are Laguna Grande in Fajardo on the east coast, Mosquito Bay on the island of Vieques, and La Parguera in Lajas on the southwest coast. Our map of the bio bays shows each one and which is closest to where you are staying.
No, the Vieques bio bay does not work as a day trip from San Juan, because the tour runs after dark and there is no same-day ferry back to the main island. Plan at least one night on Vieques. For an evening trip from San Juan, the Fajardo kayak tour runs every night with hotel pickup.
Yes, the Fajardo bio bay is worth it for most visitors staying in San Juan or on the east coast. Laguna Grande is the closest bio bay to San Juan, the kayak tour runs every night of the year, and hotel pickup means no driving. Pick a dark night on the moon calendar for the best view.
Yes, two of Puerto Rico's three bio bays are on the main island: Laguna Grande in Fajardo on the east coast and La Parguera in Lajas on the southwest coast. Neither needs a ferry. The third, Mosquito Bay, is on the island of Vieques, so that tour needs at least one night there.
The La Parguera sunset boat and bio bay tour is the best fit for young kids, because it has no minimum age and nobody has to paddle. The Vieques clear-kayak tour takes ages 3 and up. The Fajardo kayak tour is for ages 6 and up, with each child sharing a kayak with an adult.
La Parguera is the bio bay you can see from a boat on our tours. The La Parguera sunset tour rides out to Caracoles island for sunset, then takes an 8-minute boat ride to the lagoon after dark. The Fajardo and Vieques tours are both in two-person kayaks, clear-bottom on Vieques.
La Parguera and Vieques suit different trips. La Parguera is a sunset boat tour on the southwest coast with no minimum age, running on select nights each month. Vieques is a clear-kayak tour on Mosquito Bay for guests spending at least one night on the island. Choose by where you will be staying.
The Fajardo kayak tour at Laguna Grande runs every night of the year, with two evening departures timed to sunset. The La Parguera sunset boat tour runs on select nights each month, shown on the moon calendar. For the Vieques tour, send us the nights you are staying on the island and we confirm your dates.
Laguna Grande in Fajardo is the easiest bio bay without a car, because the Fajardo kayak tour offers round-trip hotel pickup from San Juan, Rio Grande, Luquillo and Fajardo for $145 per person. The La Parguera tour includes courtesy transportation too, which makes the farthest bay an outing with no driving.
The La Parguera tour includes a sunset: a 5-minute boat ride takes you to Caracoles island, where you relax on the boat and watch the sun go down over the water. After dark, the boat continues to the glowing lagoon. It runs on select nights each month.
Send us your dates and your hotel area on WhatsApp, and we will match the bay and the darkest night to your trip.