Originally Posted by swampjeep
I believe in TN, you can do an underground zip line just off the highway, there's signs for it on I-75.
or maybe check out Mammoth cave, not sure how far it is, but it's something I've wanted to do, and just not been able to.
That is not along the I-75 corridor, its over north of Nashville, a little west of I65. But if you aren't in a huge hurry, its not that much further out of the way to go that way, then down through Nashville, back over to I75 by chattanooga.
Fun place, Patrick and I went there coming back from KillerB's house, it was a very good time.