Anywho, one non-deoderant piece of advice I have for you is this: schedule a block of time every day to go back to your hotel room and reboot. Take a nap, a shower, change your clothes, whatever. We just got back from our honeymoon--it isn't even summer yet, mind you--and the first full day we were there I got a touch of sun stroke or heat stroke or *something* that made me sick to my stomach and feel dehydrated. And I'm a native Floridian! I can't imagine how out-of-state folks handle it! After that first awful day, we came back to the hotel every day around 2 or 3 and de-stressed, then were able to enjoy the rest of the day.
Good luck! And drink lots of water! (We bought some from Walgreens and stored it in our hotel fridge, since Disney only sells Dasani, which I am NOT a fan of.)