At all of the resorts I displayed 3 pieces of ID; Drivers license (for picture), DVC card, and hotel card (to show that I was a current guest). The only place that actually looked at them was Polynesian when I got towels, and Wilderness Lodge, because I needed to check out a life jacket for my six year old (accidentally left it back in the room). You should always be prepared, and remember it is a priviledge not a right to use their facilities so we always need to be on our "BEST" behavior to ensure a lasting opportunity.