I have ridden the entire route several times. There are portions that start to get interesting coming out of Missouri. There are small sections of the "Old Highway" that are very narrow and pop out of Missouri for 13 miles of Kansas and then into Oklahoma. There are some portions that are somewhat interesting in Oklahoma but most of the old highway are now interstate. Coming out of west Texas where you see the Cadillac Ranch is when things begin to liven up. I always loved the ride starting at Tucumcari,, New Mexico all the way through New Mexico and into Arizona. Both of those states are just flat our enchanting. Early fall and late spring are the best times to ride those areas. The colors of the red rock countryside cannot be matched. The clear blue skies and the crisp air is great. you will get to see the Painted Desert, Petrified Forest and a day in Santa Fe downtown is great. Try a meal at the Bull Ring restaurant or the Blue Corn Cafe. Flagstaff Arizona provides soooo much to look at around the area, like Sedona and all of the red rock in that area. You could spend several days around the Flagstaff area. There are a lot of ruins in that area. I do not have enough room to cover all that you could see in that stretch of road through New Mexico and Arizona. Stay out of California. You have to spend the night in the La Posada hotel in Winslow, Arizona. Incredible restaurant and a place built when the Harvey Girls were in style. You can take your picture "Standing on the corner in Winslow, Arizona." By far, the best motorcycle tour guide for the entire country is "Great American Motorcycle Tours" by Gary McKechnie. This is all you need to tour the US. He goes into routes, places to stay and eat and places to avoid. I have used that book for years. Have fun.