LaurenT- I just got back from Disney last weekend. I was able to bring sunscreen in my carry-on. As long as it is the spray version, and not the kind you have to put on by hand, they allow it. At least they did for me.
Some good tips from people on here. My countdown consists of rereading Walt's biography before each trip. It helps remind me why I love that place and helps me appreciate it even more when I'm there.
I'll go with the obvious ones and say not to forget your magic band, magical express voucher, etc...