1. Don't bother with the ponchos. By the time we got them on we were already drenched. And sit on those wet benches! 3/4 of our trip all the benches were wet from rain, and I was hesitant to sit...forget that! Sit on those benches and get a nice wet mark on your butt! 
2. Don't count on the plans you make. I had a whole schedule typed out. Which park, which day, which table service. We dropped that the first day and did 'freestyle' vacationing. Also, we weren't big on table services. It cramped our style. 
3. The free dining was A LOT of food. I was never hungry, eat eat eat eat. But that's okay...all that walking cancels out the pounds, right?