From $89
Bioluminescent Bay in Fajardo
Laguna Grande in Fajardo is one of the few bioluminescent bays in the world, a mangrove-lined lagoon where microscopic dinoflagellates light up electric blue when the water is disturbed. Tours leave after dark and paddle a narrow mangrove channel by kayak before reaching the open lagoon, where every paddle stroke and fish dart leaves a glowing trail. It is a completely different experience from the daytime cays, and it pairs naturally with a morning Icacos trip from the same marina.
The glow is strongest on dark, moonless nights, so check the lunar calendar when you plan. Guides provide the kayaks, life vests and headlamps for the channel, and no experience is needed since the route is short and sheltered. Wear quick-dry clothes and bug spray applied before you arrive, never in the lagoon. The tours below run the Laguna Grande bio bay by kayak with departures timed to the darkest part of the evening.
From $89
Frequently Asked Questions
When is the bioluminescent bay brightest?
On dark nights with little or no moon. Plan your tour around the new moon and avoid the few nights around the full moon when moonlight washes out the glow.
Do you need kayak experience for the bio bay?
No. The mangrove channel route is short and sheltered, and guides give a quick lesson. Tandem kayaks are available for children and nervous paddlers.
Can you combine the bio bay with an Icacos day trip?
Yes, and it is a popular combo. Sail to the cays in the morning, rest in the afternoon, then paddle Laguna Grande after dark, all from the Fajardo area.