Trinidad and Tobago (T&T) are on my list for a couple of reasons. One, my parents went there for a wedding, and I was super jealous that I couldn't go. So I want to go back. And two, it is an island, which continues my accidental theme of islands.
T&T have the ultimate white sand beaches, you know those photos of paradise with the palm trees in it were probably taken there. I would go just to sit and relax on the beach all day long.