several good suggestions already
I must agree with the Animal Kingdom Lodge suggestions - Boma is very good, and Jiko is excellent - also, the atmosphere at the resort is just so nice, and its a fantastic place for a before or after meal stroll
California Grill at the Contemporary is very, very good, and has the benefit of the great view.
Citricos at the Grand Floridian is good, and Victoria and Albert's is in a class by itself (love it).
I also have good memories of O'Hana, but it has been so long since I've been there I'd be hesitant to 'vouch' for it (though it sounds like its still very good).