Be sure to follow the old 66 through the small towns along the way. For example, it's faster to bypass Tucumcari, NM, but if you take the exit, you get to see some classics like the Blue Swallow Motel which was built in the early days of the route and is still in operation. The rooms are quite small by today's standards, but clean and well-kept. It depends on whether you want to go fast and just say that you rode the route or you want to see some of the history, but for me, the small towns are a lot of fun to see.