Anguilla has one of the beautiful beaches I've seen. Natural, unspoiled, peaceful.
Anguilla is very underdeveloped and may seem overly expensive, however, the prices are similar to Bermuda's. Anguilla is near St. Marten, if you are in St. Marten, go to the French side pier and ferry yourself over (20 min ferry ride) and check out this island.
We stayed in Anguilla for 7 days and that was more than enough to enjoy beautiful island's beaches and restaurants.

Don't be dissapointed if you don't see shopping malls or casinos, as I wrote before, Anguilla is very underdeveloped. THe only thing Anguilla has that others don't are long, white sand beaches with noone on them.