The book that I always take to JA with me to read again is THE DUPPY by Anthony Winkler which is hilarious. When I die, I definately want to go the Jamaican Heaven (not the US Heaven which is a totally different place). On my last trip, several Jamaican friends read it as well and they loved it as well. It will help your reading if you have a little bit of patois under your belt.
Winkler is a Jamaican born and raised author. One of his other books THE LUNATIC is also a good read on the beach (this book was also made into a movie of the same name).