Wallet which will have money, credit cards etc... in a zip-lock (to keep it dry)
Camera and extra batteries
Rain gear cheap disposable rain coat
First Aid bag band aids, Advil, tums, etc...
Sun Glasses these I wear
Snack size zip-lock to keep tickets, and also fast passes
Car keys if I drive
Water 4 bottles frozen, 4 cold (one of each for my family)
Snacks depends on what everyone puts in the pack
If I was packing for myself, if it didn't fit in my pockets, I wouldn't take it.