Colorado we loved Pikes Peak, Horse/Mule riding Garden of the Gods, Colorado Springs, Durango, Ouray? Green River areas. There was a beautiful waterfall just besides the road (can't remember name or where sorry!), it lit up at night as well.
SD = Spearfish hatchery, Deadwood, Sturgis, Wall Drug = Kitchy place but worth look see.
WY = Cody - could spend days there easily with the museum, old village, evening theatre with meal. Also check out the Earthquake Lake area as you go through. Also the WM here was really nice for Dry Camping O/N a couple nights with their blessing in 2017.
