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Tip 1: anything you've heard about food portions being huge in the US will be shown shockingly true at Disney. They don't serve anything that is smaller than your head.
A second tip: go on the water rides before the heat of the day, as the lines get long long long long long as soon as people have lunch.
Lastly: if you liked Pirates of the Carribbean, make sure you go on the ride. Also, it's cool (temp-wise) in there, which makes it a nice break from the heat. So is the Haunted Mansion. (I'm assuming they have the same rides at Disney World as Disneyland.)
Have a great time!