Take an afternoon and go to the campgrounds. Walk
around, go horseback riding, or rent a boat, then go to the dinner
show. It was really a nice way to spend the afternoon and evening.
Just be sure to allow enough travel time, some of the bus routes are rather long.
For a moderatly priced meal I'd recommend the Trails End Buffetaria. We really enjoyed our meal there and thought the price was fair compared to other dining options around WDW. In 2008 it was $12.99 for the all you can eat lunch, which includes softdrinks.