Vieques is home to a true natural wonder: An enchanted bay with water that glows at night. The Bio Bay's magic is the work of billions of micro-organisms that, when disturbed, produce a faint green glow.
The best way to see the Bioluminescent Bay is with a knowledgeable guide on a clear, moonless night. From boat or kayak, you will see glowing waves and fish that turn into comets.
Take a swim in the Bio Bay, and your movements are accompanied by glowing trails. For many travelers, a trip to the Bio Bay is the highlight of their vacation on Vieques.