Thanks to all three.
Museums are always good, as are parks/monuments, or even awesome local places of interest. I was mainly looking for things relatively close to the freeway (the 40). As yet the only thing I have planned is a stop for lunch at the Grand Canyon. Otherwise, I have seen most of California, and a lot from Chicago out east. I have never been anywhere in between. All I have seen of that land, is the view from a plane.