DH and I visit this area several times a year. Most definitely visit Cades Cove. Go early morning or in the evening.
I. would also suggest visiting Dollywood. We’ve only been there once, and didn’t ride a single ride, but we loved it and can’t wait to visit again. I know they allow you to purchase a pass later in the day, and you can visit for the rest of the day and then the entire next day. I would do that for sure.
Ride a mountain coaster. Our kids loved that. And, try to do a dinner show in Pigeon Forge. We have done several, and they’re definitely worth it.
Most of all, have fun!