FL to Aruba in April
Jeff, there''s no reason to worry about hurricanes down in the ABC''s. Even the eastern end of the VZ coast has no hurricane incidence (unlike Trinidad and Grenada, both of which are viewed as safe but in fact have this same ''Ivan-like'' event happen every decade or two. You will in fact be much safer re: storms down in the ABC''s than you will be in Florida.
There''s quite a substantial southward migration of Caribbean cruising sailors in the summer months, altho'' some of the destinations (the VZ coast, Chag Bay outside Port of Spain in Trinidad, Margarita et al.) can suffer from weak Trades, high humidity and lots of heat. In some ways, the ABC''s are a great alternative, as WRT Bonaire you anchor off the leeward side of the island off a mooring, and will be able to scoop up whatever wind there is.
I think you need to read VanSant''s book and generally brief yourself on summer conditions in the S Caribbean, and then make your decision. Good luck to you...