I am more into backpacking than ruins and historical stuff but here is an abbreviated list of my MUST SEE with comments:
Yellowstone National Park
- do the Chief Joseph highway (WY 296) and 212 to Billings, MT
- lots of NF campgrounds that will be way cheaper than NP campgrounds.
- boondocking doable, but hard to find.
- it is prime grizzly country.
Grand Canyon NP
- boondocking available in Kaibab National Forest on the North Rim.
- South rim is more developed. don't know about boondocking.
Banff, Jasper, Yoho, Kootenay National Parks, Canada
- Banff: too touristy for my taste but spectacular views.
- Jasper: Hwy 93 is worth the trip, then on to Robson. You won't regret driving back down 93!
- Yoho: my favorite, but mostly for backpacking. Lots of elk in Kicking Horse campground.
- Kootenay: mostly backpacking.
Mount Robson Provincial Park, British Columbia
- spectacular mountain. West of Jasper.
Yosemite
- if you can, go in the off season (is there an off season?)
- way to crowded for me. I was there in the early '70s.
Denali National Park
- long ways away, but spectacular.
- worth taking a plane tour from Talkeetna.
Rocky Mountain National Park
- my experience here is mostly backpacking and climbing.
Zion National Park
- if you can spend time in Southern Utah go to all the National Parks and Monuments (I think there are 9).
That's a start. I'll think of more right after I post :blush:
-- Spiff