A lot of music venues and not just country music. You can hear live music at dozens of places.
Thursday night used to have "Dancing in the District" free live concerts down at the riverfront on 2nd ave.
Opryland Hotel is impressive.
March will be a great time to see nature in Tennessee, drive out to the Cheekwood area for the botanical gardens; or just anywhere south of town to see lots of dogwood, laurel, forsythia and so forth.
Franklin has several antique malls and older homes to check out.
Those interested in space and rocket can tour Arnold Engineering Center and / Or University of Tennessee Space Institute between Tullahoma and Manchester.
Jack Daniels (one of my former carpet cleaning clients) and George Dickel both offer tours of the distillery. Lynchburg where Jack Daniels is located has a nice old-time square and invites tourists to sit a spell.
Several rib places and even some good Italian cooking can be found.
Nice shopping malls and restaurants plus brew pubs just off I-65 south going toward Franklin.