Go kayaking (or canoeing) at night in the bioluminescent bay in Puerto Rico. It literally glows at night. go off the main island, if you go out of the bay it's a beach that you can only get to by kayak or swimming.
The Pelion peninsula, is just as unique and beautiful underwater as it is above. In the deep blue waters of the Pagasetic Gulf and the Aegean Sea, one discovers an amazing undersea world. ~ A stunning photo of Agia Kyriaki by Nicholas Samaras