Bioluminescent Bay Tours

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By daylight, Fajardo's bioluminescent lagoon appears just as scenic as any other bay on the tropical Puerto Rican coastline. But come nightfall, the Laguna Grande bio bay glows fluorescent with every movement and splash, thanks to the presence of microscopic plankton that thrive in the shallow Caribbean waters. Read on to learn how to take your own memorable Bio Bay tour.


The Basics

Bio bay tours allow visitors the chance to set the water aglow and create a trail of light with every stroke of a kayak paddle. To see the bioluminescence, night trips are offered around the cycles of the moon, with ideal timing on the darkest nights. These guided kayak tours are available departing from San Juan or Luquillo, which is only nine miles (15 kilometers) away. It’s common to couple kayaking with an afternoon nature walk to La Mina Falls in the nearby El Yunque National Forest.


What to Expect When Visiting the Bioluminescent Bay

Bio bay kayaking trips frequently set out in the early evening around sunset, launching from Las Croabas with a tour guide or instructor. These kayak tours travel through a dense collection of mangrove trees under a total canopy of darkness, and once you’re out of the mangrove tunnel, the stars above provide the only light by which to view the glowing waters, where the tips of your paddles will slowly begin to glow as they strike the liquid surface. There’s no swimming in the bay during this popular Puerto Rico vacation activity, but it’s easy to pass your hand through the water over the side of your kayak.


How to Get There

Laguna Grande is located in the Las Cabezas de San Juan Nature Reserve just off the shores of Fajardo, about 40 miles (65 kilometers) or an hour’s drive east of Old San Juan, a major tour departure point.


Why Does the Bio Bay Glow?

Although the glowing water often gives visitors a magical feeling, this spectacular natural wonder is actually caused by pyrodinium bahamense, single-celled organisms that glow when disturbed. The bay is surrounded by red mangrove trees, native to the surrounding El Yunque rainforest, that provide vitamin B12 to the marine plankton and create the perfect environment for their survival. There are only a handful of places in the world where this natural phenomenon is consistently found, two others of which are also on Puerto Rico, the Island of Enchantment: at Mosquito Bay on Vieques Island and the bay at La Parguera. 

Location
Address: Laguna Grande, Fajardo, Puerto Rico
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6 Tours & Activities to Experience

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El Yunque Rain Forest Nature Walk and Bioluminescent Bay Kayaking Combo Tour

Spend an adventurous day exploring two of Puerto’s most incredible natural wonders on this 11-hour day trip to hike in El Yunque rainforest and kayak at the island’s famed Bioluminescent Bay. Start your morning with a hike in the only tropical rainforest in the United States National Forest system, enjoying incredible mountain views and an optional waterfall swim to cool off. Then continue with a nighttime kayaking trip to the magical Laguna Grande, a bay on Puerto Rico’s east coast featuring a unique variety of plankton that glow when the water is touched or moved. Your Puerto Rico outdoor adventure also includes round-trip hotel transport, snacks, professional guide and national park fees.
  • Duration: 11 hours
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USD165.00
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  • Duration: 11 hours
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USD165.00

La Parguera Glowing Bioluminescent Bay Tour from San Juan

Swim and snorkel in the bioluminescent bay at La Parguera during this 8-hour tour from San Juan. Learn about this natural phenomenon through your guide's informative commentary during a short boat trip through the mangrove forests on the way to the bay. Slip on the provided snorkel equipment and dive into the water after dark, surrounded by tiny, harmless dinoflagellates that light up with the disturbance of the water. A light pre-swim dinner at a local restaurant is included, as well as round-trip transportation from your San Juan hotel. 
  • Duration: 8 hours
From
USD199.00
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  • Duration: 8 hours
From
USD199.00

Bioluminescent Bay Glass Bottom Kayak Tour from San Juan

Join a nighttime adventure into the waters of Laguna Grande as you visit the area’s amazing bioluminescent bay during this 5-hour excursion. Hop aboard a clear-bottomed kayak as you paddle through the dense mangrove forests, heading to the area where the microscopic 'Pyrodinium Bahamense' plankton puts on its surreal aquatic light show. Glide your paddle through the waters of this beautiful site, watching as trails of gleaming light seem to emerge like magic. Your professional guide will also tell you more about this fragile ecosystem and how visitors can help protect it for future visitors. Your bioluminescent adventure also includes round-trip hotel transport from San Juan, site entrance fees, kayaking gear, snacks and bottled water.
  • Duration: 5 hours
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USD105.00
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  • Duration: 5 hours
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USD105.00

Bioluminescent Bay Kayak Adventure Tour from San Juan

Kayak through the waters of Laguna Grande, the only bioluminescent lagoon in the world, during this 5-hour tour from San Juan. Under the starry night sky and the historic Fajardo lighthouse looming above, watch the glowing organisms in the water light up as your kayak slices through the water. Paddle through stands of mangrove trees and watch small fish dart through the water underneath your boat like shooting stars. Stop for a break with snacks and refreshments before heading back to your starting point. Use of all kayaking equipment and round-trip hotel transfers are included.
  • Duration: 5 hours
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USD105.00
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  • Duration: 5 hours
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USD105.00

La Parguera Bio Bay Boat Tour from San Juan

Enjoy a sunset cruise followed by an exploration of one of Puerto Rico’s bioluminescent bays during this 10-hour excursion from San Juan. Experience the glowing rays of the sun as they fade into the ocean. Then see a different type of glowing as you explore the bioluminescent waters near the town La Parguera.
  • Duration: 9 hours
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USD175.00
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  • Duration: 9 hours
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USD175.00

Bio Bay Kayak Tour in Fajardo

Take a night kayaking tour from Fajardo through the mangrove channels to Laguna Grande. Here you can find the billions of microscopic plankton that live in the water and light up at the touch of your hand to create a beautiful, iridescent glow in the water. Learn about this natural phenomenon and its fragile ecosystem from your informative guide as you paddle through the lagoon.
  • Duration: 2 hours
From
USD53.52
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  • Duration: 2 hours
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USD53.52


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