Hi Susanmaz... I too am dying to know. We're going to Grand Turk on the Westerdam for the first time in November...
I've heard some people say that the cruise ship center (built by Carnival) is a bit of a tourist trap... pricey. Food at Jimmy Buffet's is supposed to be expensive. Apparently, you can use the pool/chairs for free, but waiters come by encouraging orders. I've heard the beach is rocky there.
I think someone in one of the other posts recommended a taxi service on Grand Turk that takes you to a very nice beach for not much money.
I'll post the name if I can find it.