Most everyone who spends a week on St Thomas always ends up having at least one day free to get off the island.  Provided you have a current Passport, taking the time to go to the BVI gem, Jost Van Dyke, is a must.  White Bay and the infamous Soggy Dollar Bar host what some claim as "the best beach scene in the entire caribbean".  You will have to rent a boat for the day, which can get pricey, or call on one of the water taxis ( Dolphin Water Taxi out of Red Hook for $55/pp each way).  Google. "White Bay" or "Jost Van Dyke" and you can see the views!