Vieques is home to the brightest bioluminescent bay in the world. If there is something you must do during your vacation in Isla de Vieques is to visit the bio-bay. Make sure you hire a licensed operator. There are several illegal operators around the bay. Licensed ones are trained and care about protecting the bay for our children in the future. Current laws forbid a licensed operator from letting a tourist enter the bio-bay waters. This is so to protect the bay from pesticides, sun blockers and other chemicals tourists use on their skin that are dangerous to the bay. Visit by kayak, electric boat or fisherman's boat but do not skip this natural wonder. Do not miss a trip to the bio-bay while in Isla de Vieques.
The 'Bahia Fosforescente' (Bioluminescent Bay) at Puerto Mosquito should be listed as the eighth natural wonder of the world. The microscopic organism responsible for the glow in the water when agitated is a protozoan of the family dinoflagellata, a unicellular organism with two flagella that allow it to move through the water. The most common protozoan in Puerto Mosquito's waters in the Pyrodinium bahamense.