Fajardo's Bioluminescent Bay: A Local's Guide to Kayaking Laguna Grande
Picture this: it's dark, the mangroves close in around your kayak, and every time your paddle hits the water, it lights up. Little sparks swirl around your hands. Fish leave glowing trails under the boat.
That's Laguna Grande, Fajardo's bioluminescent bay, in the Las Croabas area on the northeast corner of Puerto Rico. Puerto Rico has three bio bays, and this is the one closest to San Juan. Here's everything you need to know before you go.
What makes the water glow?
The lagoon is full of tiny single-celled organisms called dinoflagellates. When something moves the water, they give off a quick blue-green flash of light. Millions of them together make the water sparkle around your paddle.
The mangroves around the lagoon help keep the conditions right for them, which is why protecting this place matters so much.
What to expect on a bio bay tour
You paddle at night. Tours leave around sunset, so it's dark by the time you reach the bay.
A guide leads the group. You'll paddle in a line through a narrow mangrove channel, then out into the open lagoon.
Most kayaks are doubles, so you share the paddling with a partner.
Once in the lagoon, the guide explains the glow and gives you time to see it up close with your hands and paddle.
No experience needed, but you should be comfortable paddling for a while and following directions in the dark. The channel can get busy, so stay calm and listen to your guide.
The best nights to go
The darker the night, the brighter the glow. Plan your visit for nights close to the new moon, when there's little or no moonlight. Around the full moon the glow is much harder to see.
Clouds and a little rain don't ruin the experience, and sometimes a cloudy night is even darker. Check a moon calendar before you book, and book early for the darkest nights: they sell out first.
Why you can't swim in the bio bay
Swimming is not allowed in Laguna Grande. The organisms that make the glow are fragile, and sunscreen, lotions, bug spray and body oils can harm them. Keeping people out of the water helps protect the bay for the next visitor and for the next generation of fajardeños.
During the tour, keep it gentle: paddle normally and let the guide show you the glow. Don't scoop, splash or take water out of the lagoon.
What to bring
Clothes that can get wet and water shoes or sandals that stay on your feet.
Bug repellent in cream or balm form, not spray, applied at least 30 minutes before the tour so it's not going into the water. The mangroves have mosquitoes.
Skip the sunscreen at night. You won't need it, and less in the water is better.
A dry bag or waterproof pouch for your phone and keys.
Water to drink before and after.
Leave the flashlight off. Light makes the glow harder to see for everyone.
A quick note on photos: the glow is beautiful but very hard to capture with a phone. Enjoy it with your eyes and keep your phone safe and dry.
Book a licensed operator
Only book with licensed tour operators. They know the rules of the lagoon, provide life jackets and guides, and help protect the bay. Wear the life jacket they give you the whole time you're on the water.
Booking through our link supports Enjoy Fajardo, a non-profit that promotes the town, at no extra cost to you.
Make a full day of it
Morning on the water: a catamaran trip to Icacos Cay is the top-selling tour in Fajardo. See catamaran tours
Afternoon at the beach: Seven Seas, run by the Municipality of Fajardo, is the only beach in Fajardo with lifeguards. Follow the flags and check conditions at swimsafepr.com before you go.
Dinner before the tour: fresh seafood in Las Croabas, the fishing village right by the lagoon, or alcapurrias from a roadside chinchorro like Margis Pincho. See where to eat
Selfie stop: the Enjoy Fajardo mural at Parque Pasivo Las Croabas.
Getting there
Laguna Grande is in Las Croabas, Fajardo, about an hour from San Juan's airport depending on traffic. Uber works inside Fajardo, but a ride from San Juan or Carolina costs around $120 to $140 each way. If you're staying a few days, a rental car is the easiest option. See car rental
Want to stay close? Find a place to stay in Fajardo.
Quick FAQ
Can I swim in the Fajardo bio bay? No. Swimming is not allowed, to protect the organisms that create the glow.
When is the best time to see the bioluminescence? On dark nights near the new moon.
Do I need kayaking experience? No, but you'll paddle for a while, so be ready for some light exercise.
Is the Fajardo bio bay the same as the one in Vieques? No. Fajardo's is Laguna Grande. Vieques has Mosquito Bay, and Lajas has La Parguera.
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