Replying to Caribbean...

So I'm graduating hs in June and for my graduation present, my parents are paying for plane tickets to somewhere "not too far away." Europe is out of the question because I will have to pay for everything else. I can go somewhere for a week with a group of about 4-6 in August. I was thinking about somewhere in the Caribbean... like St. John's or something. I've been to some places in the Caribbean before, but does anyone have suggestions for towns to stay in for a week? We are thinking about pooling our (quite limited) funds and staying in a small house right by a beach...