Maybe. Most states have "cooling-off" laws; these let you get out of a timeshare contract if you act within a few days after signing (usually within three to ten days, depending on the state). If there is no cooling-off period, or if you change your mind after the time has passed, your only recourse may be a formal lawsuit. Timeshare sellers are accustomed to handling claims from unhappy buyers and are unlikely to refund your money unless they're forced to do so. However, lawsuits can be expensive -- you may be out of pocket even if you win.