Hit MK and EC for sure. Hit AK if you can, maybe split AK/HS if you must. Try a water park or mini-golf - on-property or out on Intntl Drive.
Prepare to sweat your... Mickey ears off.
AK is actually the one I am most sure of. I've been to Disney maybe 7 times now (from the midwest) and DAK is, in my opinion, the besy it have such great theming, and gpod rides mixed with some educational aspects. I am hearing a lot of Epcot though! What is its best part?