My husband and I took the same trip from Tennessee last summer, and we had a great time! We stayed at some great campgrounds, and there's TONS to see and do along I-40; there's a lot of Route 66 detours. In particular, we loved Oklahoma City (cheap, easy to use trolley to tourist attactions and the Cowboy/Western Museum...I could move in! Little Rock has the school which integrated in 1955 - moving and educational! Amarillo is nice and a short ride to Palo Duro - complete with jeep tours (with steer horns). We stayed in Williams and took the train, too. It was fantastic, and Williams is a cute little town with a lot of Route 66 stuff to explore. We spent the night and took the train back the next day. Morning walk, elk grazing on the rim and great breakfast! We also visited Sedona and took a hot air balloon ride. There's a zoo outside Sedona, too, and there are camel rides and you can feed the giraffe. Worth it? I don't know, but it was fun! It's a great trip! Enjoy!