I know this is a bit off your original question, but it may help. Unless you have an idea already of how you want to make your way around the islands, try this:
I was sent over there for a month on business and found the CDs to be great. I borrowed mine from a co-worker who had gone previously, but I believe you can rent them from some car rental agencies if you don't want to buy direct.
Also, the bathrooms around the island were very clean, but had no soap - you may want to pack a travel size with you.
And don't leave *ANYTHING* in the car, especially food. What the thieves don't get, the roaches will.