Nowadays summer vacations can be planned, booked and customized without ever picking up the phone or even logging into a laptop. Hundreds of apps exist solely to create the ideal vacation experience. Smartphones can be used to pay for things while on vacation, but with the advent of wearables, even that may someday seem cumbersome. Some theme parks and resorts are already looking to design a more seamless experience with radio frequency identification (RFID) in the form of a wearable, a....