A bit north/northeast of Nashville, (Goodlettsville, Hendersonville and Gallatin), there are enough geocaches of varying sizes, difficulties, etc. to keep you busy for days. Check out the site across from Bill Golden's house (15 Miles Per Hour), No Good Joker Did It Again (in Gallatin), Steeple Corner (Hendersonville), "x" Crossing Guard (H'Ville), and 40 Love and Casper's Ghost (in Goodlettsville). And there's enough microcaches to fill up the rest of your time.
Have a great trip!!!!