What about taking a walk and enjoying the beauty? If you look at birds, butterflies, flowers, trees, plus the beauty of a stream. Got a camera? Take some neat, abstract pictures.
Tennessee is full of lakes. Rent a boat? Go fishing? Go swimming.
How about picking blueberries on the buffalo farm? Then you can either bake or get someone to bake a blueberry pie. I’m assuming you have done all the Davy Crockett stuff.
Hang out at the Dairy Queen with free wifi on Hwy 43 and Fluther.
How about a drive around Amish country? If there’s a place to eat there, they usually have great food for reasonable prices.
What about taking a bus trip to Nashville for the day one day?