Kayak Bio Bay Tour

Bio Bay Bioluminescent Kayaking Tour in Puerto Rico

Bio Bay Kayaking Tour Laguna Grande
“Laguna Grande” located in the “Las Cabezas de San Juan” Nature Reserve

One of the most spectacular sights on a night trip in Caribbean waters is to witness hundreds of tiny star-like bioluminescent plankton scintillating like a starry sky as you move through the dark water. Wave your paddle through the water in front of you, and be mesmerized by the tiny glowing specs of plankton or Dinoflagellates which are tiny unicellular marine plankton also known as fire plants.

Fajardo’s bioluminescent bay is one of few scattered around Puerto Rico – and one of the last that remain on the planet! Experience this rare phenomenon of nature as you glide through the tranquil “Laguna Grande” surrounded by mangroves and teeming with sea life above and below the still water.

Bio Bay Tour Vital Statistics

Bioluminescent Bay Tour, Fajardo Puerto Rico
Entering the “Laguna Grande” is a mind-altering experience!
  • Tour Duration: 2 hours – Sunset Session 5:30pm to 7:30pm / Evening Session 7:30pm to 9:30pm
  • Days of Operation: Mondays thru Saturdays
  • Summer check in time:
  • Sunset Session: 6:00 pm - 6:30 pm
  • Evening Session: 8:00 pm - 8:30 pm
  • Winter check in time:
  • Sunset Session: 5:30 pm - 6:00 pm
  • Evening Session: 7:30 pm - 8:00pm
  • Tour Distance: 1 mile each way
  • Ages: All family members welcome / physically fit to handle a kayak with paddles (children 5 yrs+)
  • Location: Las Croabas beach, Fajardo, Puerto Rico
  • Cost per person*: $48 p/p plus taxes
  • Max Weight: For a two adults kayaks 575 pounds.
  • Please read our Safety Requirements and Limitations

Transportation Available

$25 p/p for 6 persons or more from most locations in Metro San Juan, Hotels and Guesthouses on Puerto Rico’s Northeast coast (Rio Grande, Rio Mar, Luquillo and Fajardo) Note: If your party is less than 6 persons, call us and we’ll try to match you up with other guests.

Kayak Bio Bay Tour $47pp, includes taxes + DRNA fees!

*Family & Group Charters available. Please call us direct 787-206-0290
What to Bring: towel, dry change of clothes and a camera!


  • Bottled Water and Juice Drinks
  • Snacks
  • Quality Kayaking Gear provided
  • Small size gear for Children
  • Kayaking Orientation and Instructions

Bio Bay / Laguna Grande Kayak Tour Description

Kayaking to entrance bio bay tour puerto rico
The Bioluminescent Adventure begins!

Once-in-a-Lifetime Bioluminescent Experience!
At the prescribed time, we meet on the beach of “Las Croabas”, a small fishing village located on the extreme northeastern tip of Puerto Rico. Your Eco Adventure guides call the group of Kayakers together for a briefing session covering basic kayak handling, rules of the road and the importance of keeping to a minimum any disturbance of the pristine environment of the bioluminescent lagoon.

Hidden Entrance in the Mangrove
Then we launch our kayaks and head for a hidden opening in the mangroves at the northern end of the beach. Upon entering the mangroves, we follow a channel for a mile that leads to the “Laguna Grande”.

mangroove trees of laguna grande
Mangrove trees provide nutrients for the glowing plankton

Inside “Las Cabezas de San Juan” Nature Preserve
Leaving the channel and entering the lagoon, by itself, is a breathtaking experience! A wide expanse of gentle, rippling water surrounded by mangrove forests greet the adventurer, the mountains of the “El Yunque” Rainforest tower in the distance – a profound tranquility envelopes all who enter!

The Glow of Bioluminescence!
But the best is yet to come! Your guides call the flotilla together for an informative talk about several topics: this unique ecosystem, the flora, fauna and sea life that inhabits the lagoon, historical notes of interest such as the Fajardo Lighthouse, built by the Spanish in the 19th century, and of course the incredible natural phenomenon that we’re here for - the shimmering glow of bioluminescence as you dip your paddles and glide through the sparkling water – an amazing unique experience only found in 4 other places on earth!

Just so you know… Bioluminescence is best experienced on a cloudy or moonless night. If you book our tour 3-4 days before & after full moon, the luminescent effect can be lessened. For those days of bright moonlight, we provide curtains to reduce light pollution. Click here to see current moon phase.

Then it’s back through the channel to the launch site where guests are served water, juices and light snacks.


book now online or call 787-863-2821

pick up and drop off times

driving map and instructions

snorkel day trip to culebra

do it all in one day! combo #2 hiking el yunque rainforest and kayak bio bay plus save details