Nashville: The lanemotormuseum.org has the most interesting collection of cars and other stuff, probably that you'll never see elsewhere. Hopefully Jeff is there and you'll meet him. Reasonable admission. Food: I like Jack's BBQ downtown. Its touristy, but my favorite BBQ and veggies/cornbread. Arcade: See above.
Gatlinburg/Pigeon: I really like the mountain coaster, especially at night. We did the one at Ober Gatlinburg. I'm a coaster guy. Not sure if they're open this time of year or because of the fires. Like being on a wireform in your own personal gocart going down the mountain in near silence. If you have small kids with you, don't do: Earthquake thing, House of Illusions, or the Ripley's mirror maze. zzzz. The other mirror maze is more fun.