I know that you need to have your ticket in order to swipe it to get into your first park of the day. Do you need to have the ticket handy to swipe again if you switch to another park, or do you simply have your hand stamped when leaving and hve your hand scanned at the second park? (I like to carry our tickets in my money belt, which of course is a bother to get in and out of, and would like to tuck them away for the day once we use them).