They are officially only good at the resort that you bought them. Also officially, you are only supposed to use them on the same trip you bought them, however, one individual spoke with a resort manager and the response they received was they were just glad to have the people back, that they didn't have a problem with the people using them again (this was also before 9/11). We like to collect them ourselves. We currently have Contemporary, Caribbean Beach, and Port Orleans Riverside. Can't wait to collect Wilderness Lodge and the Boardwalks on our next trip.