Besides being jealous -- let me give you an objective warning as a non-ex-pat with wanderlust.
You've come to right place. Do research on this board to see others who have asked similar questions. Also, prepare to get a lot of devil's advocate advice to make you think twice. This is done out of genuine neighborly concern (by most anyway) and should be taken as a real attempt to get you thinking about things.
Out of the gate, the first thing you will hear is that 7-days isn't nearly long enough to understand the intracacies of daily living on the caye. Hope you plan on staying at least 30 at some point, in a rented establishment where you need to buy groceries, provide own transportation etc., before selling all your possessions.
Regardless, good luck. Too bad you're not there when I am so I can shake your hand and curse you for doing what I'd like to do myself