All of the above are great ideas! The only thing left that I could suggest is going to see some COOL indoor attractions such as The Pirates of the Caribbean, The Hall of Presidents, and The American Adventure in the World Showcase at Epcot when the heat becomes unbearable. These are good attractions to see if you need to cool off and rest up for a bit. As I mentioned on another thread, try to avoid the heat of midday by going early, then taking a break midday for a swim/nap, and then hitting the parks at night when things have cooled off.