From SLC go south into Canyonlands and the and from Moab (both in Utah)and go to Durango, CO and Pagosa Springs and over Wolf Creek Pass and up the west side of the Sangre De Cristo Mountains through the San Lius Valley and north into metro Denver and north into Boulder.
This is from memory so consult a map. Have fun!
From SLC, not just Canyonlands but Arches too!!
And when you get to SLC go a bit south to Draper and around there is a great restaurant, I think it is called Marketplace. Go early and sit at the bar. It gets crowded and there’s a long line but you can get a seat at the bar. Good seafood, if you can believe it in the middle of Utah! and the best bread I’ve ever had.
Then go to Arches. Climb to Delicate Arch. Canyonlands is incredible too. It’s just perfect except for coffee. If you are a coffee drinker there doesn’t seem to be any place to get good coffee. It’s worth it - even with no good coffee.