We take no bags, backpacks, fanny packs into the parks. We have no children, so don't have to worry about stuff for them. Stephen always wears shorts with cargo pockets. The camera he carries. Everything else, ponchos (if it looks like rain), a few snacks (I have to eat every 2-3 hours), his wallet with our passes in it, and that's about it. We just breeze through security. They have a "no bag" line that makes it so easy. If we want to video a parade, show or fireworks, we bring the video camera and store it in a locker until we need it.