Sunset Walk outside of Margaritaville is probably the closest off-site area. I personally haven't been there though, so no personal recommendations. There is also a Bonefish Grill down the road.
Celebration Town Tavern is good and there are other options nearby.
Further out but still under $20 for a ride are Boil Spot Hot Pot and Tokyo Sushi and Grill, both of which I've been to and are great options.