Head out along I40, from 40 check out Flagstaff, then the North Rim of the Grand Canyon. Head north and catch Zion, up I80 through SLC. Stop in Provo and check out the train museum there and Golden Spike memorial. Continue north on I15 and detour to Lava Hot Springs, ID. There is a KOA there. Continue north through Idaho Falls to West Yellstone. Head home and check out all what others cited above (Devils Tower, etc.). Little Bighorn NM is worth a stop, as is a day or 2 in Sheridan WY (KOA’s at both). Sheridan has a historic Main Street worth visiting.
