I think that you could easily spend a whole day at each even if you skip all the slightly scary rides.
AK has the BEST shows except 1, Tarzan (my fav), Festival of The Lion King, and Bugs Life. The Safari is the BEST. Then Pagani forst trail, Planet Watch, and Dino Land should round it out. They will like this parade too, a lot of fun and if you hang outside the enterance to the store by the Safaris you can get a good seat with no waiting.
MK you'll want to go on Pooh, Peter Pan (they say it might be scary, nothing is except it's dark, really nothing- I'm a whimp), small world, Dumbo, Flying carpets, Jungle Cruise, tea cups, carousel, Buzz Lightyear (multiple times), Tom Sawyer, see the awesome Mickey's Philharmagic and Cindercellebration...have a blast!