Don't forget lip balm with sunblock, sunglasses, extra batteries for your camera (mine eats AA's like they're going out of style), and some tissues.
I would agree with the other responders that you won't need extra clothes. I wouldn't go too overboard because you'll get sick of carrying it around with you. Or, start with a lot the first day, see what you actually use, and pare it down from there.
Here's what I brought last February, which barely took up any room:
- key to the World cards/other ID/a bit of cash (we didn't use much!!)
- cell phone (my hubby had his in his pocket)
- camera
- a baggie with: a few band-aids, tissues, lip balm with sunblock, a small tube of sunscreen, extra batteries for the camera, mints
autograph books and pens
- sunglasses for all 4 of us (me, DH, DS age 9 and DS age 7)
- a couple of water bottles
This year, instead of regular water bottles, I'm buying and bringing two collapsible ones - you can fill them, freeze them, and roll them up when you're done. They also have a clip if you want to attach them to your belt loops. Here's the site:
http://vapur.us/
Last of all, sweatshirts or rain coats as needed. It all fit in one bag!!
HAVE A GREAT TIME!!