This lighthouse is on the very tip of MSC's private island, Ocean Cay. The entire space is a marine reserve and used for research and conservation efforts. We spent most of a day there but ended up having to sail out early as some storms were rolling in. It made for some pretty spectacular views as we were leaving the island and heading back to the ship at the end of the day, dark storm clouds rolling in over the perfectly clear, aquamarine water.
Taken at 105mm, 1/1600 second, f/4.0, ISO 100.