My Father drove from LAS to DEN round trip last fall. I requested he let me know where he stayed and what he did. He went through Utah on the way going and Arizona on the way back. It you need more details let me know. Here is his reply:

We stayed at
Las Vegas - Luxor in the pyramid, I love it, slanted window overhead light skylight to see both he moon overhead and the airport, they have some pretty good deals.
Zion Canyon at Bumbleberry Inn was nice, kind of inexpensive, typical small town motel but famous for its bumbleberry food and jam.
Bryce Canyon park DO NOT GO NEAR Rubys. It is one of the worst customer service places I have ever been in, worse than the old Georgia stops.Nasty indifferent people.
I wish we would have driven the 30 mile gravel road, I think Canyonlands Road, just East about 10 miles from Bryce, down to near Page, AZ. It is gravel, says only 4WD but if dry a car may make it, great scenic shortcut, the end south 10 miles should be superb dry narrow low canyon. Some day I will drive that route.
The Waweah (I think) Glen Canyon National Park Lodge run by Aramark was the place they treated us like Royalty, great lodging, outstanding food, on the lake just above Glen Canyon Dam of the Colorado River, city at the dam is Page, AZ.
We then went across Monument Valley, could have spent more time there driving miles to see tall rocks but saw enough. We did not go to Canyon de Chilly (sic) but many people say it would have been a worthwhile visit, just an extra day as it is not direct Page-Durango route.
Then to Mesa Verde National Park which has some good pueblos on top and on side of a mesa but have to drive 30 miles from the highway to get to them.
Stayed two nights at Durango at the hotel, I can get the name if you want, it was very special, haunted, the best and lowest cost food in town. I want to go back to that hotel and town.
Then we drove up to Silverton, an old Wild West town, two streets but a great tourist attraction, the railroad tales 9 hours, the drive up is 1 1/2 hours, an hour in town is enough but worth it.
We then headed down towards Gallup and Sedona through Farmington.
One can go to Denver from Durango two ways.
Straight east on I think good road to the Interstate which goes up through Pueblo and Colorado Springs to Denver.
From Silverton North on fair road to I-70 and then East to Denver. There may be a route from Silverton East to Pueblo but I suspect it is mountainous winding narrow but I have not looked at it serious.

I will get more specific if this is what she wants, I especially should get the correct name of the Page and Durango hotels as wells as the canyon road if she is interested..