There are quite a lot of FTers who dive. I haven't been there, but I've heard Belize has some great diving. We're going to Molokai in February, mostly to see the whales, but a friend of mine's dive club went at the same time last year. Diving is OK there although most skipped some of the dives to just watch the whales. I'd love to dive in Palau. The good thing about most dive locations is that there is still a lot for non-divers to do.