I learned the lesson to not bring anything with me to US or IOA that can't fit into my pockets the first time we went. I refuse to wait in a line for a locker, then get in the queue for the ride. At WDW I usually only wear sundresses because of the heat, but if we go to US, I always wear cargo shorts. I have a pair of North Face tekware ones that dry super fast, have SPF 50, and aren't too terribly hideous. Tons of pockets. They make me look 10 pounds heavier because the pockets poof out, but oh well. It beats the alternative.