We live in Nashville but are still new and like to play tourist! I agree with the suggestions PP mentioned but also wanted to throw in there about areas such as Franklin, Belle Meade, and Hermitage may also have things you can do so don't just search "Things to do in Nashville". Also we just visited a great little discovery science center in Murfreesboro. Cheap, fun, and the DNiece(6) and DNephew(5) loved it! They had a boardwalk in wetlands and we got to see otters, cranes, turtles, etc. Was great fun as it is still 'city' but you don't feel that way. Also, spend some time downtown. Pretty much all places are smoke-free (unless its a 21 and up only club) so feel free to wander around. I work downtown and I can vouch for the TN State Museum, the Capital Grounds (wicked cool to read the signs on Capital Hill....for instance two architects worked on the Capital building, they didn't get along, and both are buried on property.....can you hear the ghost story now!

), as well as Fort Nashboro. However, we also have TPAC. I don't recall if you said when you are coming but from middle of April to first of June 'The Lion King' will be showing. Also, the Ballet and Symphony are options. Of course we have football, baseball, and my personal favorite hockey!

Gotta love the fights!!
Driving north can be an option as they have already said, however south to Chattanooga could be an option as well. I am not sure if I would want to do the Memphis to Nashville run however, as that would be at least a 4 hour drive....and that is driving like me, not my husband.
I do agree with the PP what exactly are you looking for? We are more than just Music City......or we can be just Music City!