I'm doing something sort of similar. My binder will have all the necessary info and they can use mine all they want. They will have binders based on their ages. For the bigger girls, they will have journals and puzzles to solve as well as website addresses so they can look up stuff on their own. It will also have a list of activities they may want to learn more about to decide if they are interested. Our 5 year old will have color and activity pages with a smaller area for journal entries. I'll include information about autographs, pressed pennies, and world showcase passports as well as coupons for things like an extra ice cream or pin in all of the ones for the girls.
Nowhere in any of the binders will you find info about character meals. While I will include menus and reservation times in my binder, they will not know characters will be there.
I'm thinking they will get the main binder with a golden ticket announcing the trip and their travel shirts at first but since we are leaving right away, I'll give their binders out in the car. They will be getting a little bit of stuff each day. I'm doing a version of Elf on the Shelf and calling it A Mouse in the House one day, A Duck Gone a Muck another day, etc. to help me disperse the rest of our stuff. Their binders are basically for the car trip so no real info is necessary. They will have plenty of crap to carry around without it.