We are plannning a road trip of aprox. 15 days and 2500 miles starting in St Petersburg for Oct/Nov 2010 . I want see Mammoth Cave and my husband wants to avoid the most congested areas of the Smokies. I am looking at Tallahassee to Chattanooga but from there would it be best to to try for Memphis and St Louis or continue North toward Ohio ? We're aiming for maximum autumn foliage plus at least one city. Would anyone recommend Cincinnati ? Thanks in advance. This site was a great help in fine-tuning our Southwest trip last May and we had a great time.