We're going in August for the first time since 1990.
Each of the kids (ages 5,8 and 10) is getting a fanny pack with a gift card inside from their Aunt for Christmas. You could also throw in a pair of sunglasses and some sunscreen, small enough to fit into your daughter's pack.
Also, based on what I've read here, I'm planning to decorate the windows of our room. I'll get some Disney clings at the dollar store before we leave.
Hit the Tips forum; there are a ton of ideas there!!!
Have a wonderful time!!!