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X2 on everything Hankaye suggested! If you plan to stop at Mammoth Cave and want to go on any of the guided tours, get on Mammoth's website and make reservations//tickets well before you arrive. Cave City RV is a nice campground, not that fancy, but nice. The Graceland RV Park (right behind Heartbeat Hotel) is a little pricey but worth it, IMHO. It has security, great place to walk dogs, etc., and you can catch the free shuttle at the hotel to go to Sun Records and downtown. In downtown is Beale Street and in easy walking distance, the National Civil Rights Museum. The Museum is a "must see", but be prepared for at least 2 or 3 hours and worth every minute! There is also a shuttle at night ($10RT) to Beale Street to hear real Memphis blues. If you stop in Nashville, be sure to take the "stars" bus tour given by Tommy. He is a hoot! And if you like music (both kinds - country and western), be sure to take in Printer's Alley some evening.

And please be careful in Houston's traffic!

Ron