the Castle, Liberty Tree Tavern or the Plaza Restaurant
Personally I would take the monorail over to one of the monorail resorts. You'll have a lot more choices.
CR - California Grill or Concourse steakhouse
Poly - Ohana or Kona Cafe
GF - Citricos, Narcossee's, GF Cafe
Or you can take a boat over to Wilderness Lodge for dinner.