There is SOOO much to see & do down there, it's really awesome!
I have relatives in Hendersonville, right near Franklin. Some abslutely GORGEOUS mansions along the TVA Rivers in that area.
There is the Plantation House museum on your way to Nashville.
Then, the Grand Ole Opry and the Opryland Hotel & Resort.
In Nashville, there is the RCA recording studios and dozens of other tours.
For dinner, you've GOT to go to the Spaghetti Factory. The food is great & the atmosphere FANTASTIC!!