RFID Wristbands for Themeparks

The use of RFID in wristbands at theme parks is catching on, to the benefit of technology vendor Precision Dynamics. The RFID-enabled wristbands support access control and metered micro-payments. ...

... "At theme parks, parents can use a kiosk to upload amounts that their children can spend, using the wristbands to buy food or play video games at the park. The microchips are coded so that the wristbands can be used only on a specific day. " ...

Via Los Angeles Times: Microchip wristbands routinely used at Themeparks