I aggree with Steve, the AKL is a good choice. The animals are fun to watch, plus there are great chilrden's activities and a great pool.
Another good option in the Polynesian. It also has a great pool (shaped like a volcano) and is just a monorail ride away from the MK!
Another good choice is the Yacht and Beach Club. The pool there, Stormalong Bay, is like a mini water park! Plus, the Boardwalk is just a walk away, with carnival type games and an arcade for the kids, and dancing for the adults after they have gone to bed. Also, the Yacht and Beach is just a boat or walk away from Epcot and MGM.
Have fun, whichever you choose!
Jacquelyn