You have a nice list there.
While in Florida you might check out Bok Tower Gardens, Tarpon Springs and Weeki Wachee while you are in Florida, all are a step back in time.
If you like such things there is an excellent museum in Ocala, Don Garlits Museum of Drag Racing.
The Blue Ridge Parkway in North Carolina and Virgina is a lovely drive, the speed limit is 45 mph which is really nice for an RV. Lots of things to see along the way too.
Mammoth Cave is really close to the Corvette Museum and factory in Bowling Green.
You can spend months, even years looking around here.