I haven’t seen it mentioned here, so I’ll add: Valley of Fire State Park east of Vegas. It was one of my favorite parts of a road trip I did from San Diego to Albuquerque via pretty much the route you’ve laid out. I car camped on BLM land outside the park and hit it first thing in the morning. Even stirred up a desert ram who picked the same roadside bluff to watch the sunrise from as I did.
Already mentioned, but I’ll double down:
- Chaco Canyon (and it’s lesser known cousin Aztec ruins, which is just off the highway east of Farmington).
- Black Canyon of the Gunnison
- Vermillion Cliffs
- Staircase/Escalante
- Capitol Reef
You couldn’t pay me to spend time in Moab after my last couple times passing through there. I liked it when I first went through in 2010. It’s an absolute madhouse/freakshow now. One thing in the vicinity that IS worth seeing is the drive up through the La Sal mountains east of there. Canyonlands is a sight to see, but I much more enjoy the crowdless areas around there like Bears Ears and all the random BLM land south and west of the Abajo Mountains
Avoid driving 40. The only thing worth seeing on it between LA and Albuquerque is Petrified Forest. US-60 is a MUCH better route, and the stretch through the Salt River Canyon is one of my favorite stretches of road anywhere.
Don’t bother with Four Corners, but Canyons of the Ancients and Monument Valley are both worth spending time in near there.