TUG is probably the best. do some homework there and read the different forums - like here, you can find a good tip almost anywhere.

Another Good reliable site to rent or sell your timeshare property is Timeshare Rentals, Timeshare Resales, Timeshare Ratings, and Timeshare Reviews If your Colonial Williamsburg timeshare is the Marriott is Manor House, it should sell. If its Greensprings, it will require some work.