Utah: Zion, Arches, Canyonlands, Flaming Gorge, the Wasatch and Uinta mountains, etc., etc.
Arizona: Grand Canyon, Meteor Crater, Sunset Crater and a huge number of fascinating early Indian habitations like Walnut Canyon, etc. in the Flagstaff and Sedona areas. Sedona's beautiful but full of touristy crapola and New Age crystal gazers.
California: If you can handle cities there's much to do in the San Francisco, San Diego and Los Angeles areas. I agree on the Reagan Library. If you like art don't miss the new Getty Museum in L.A. The state abounds in natural beauty starting with Yosemite, Sequoia N.P.'s, Shasta Lake, the Channel Islands, the Mendocino and Big Sur coastal areas, Carmel, Monterey, Catalina Island, and much, much more. And don't forget the great restaurants and the many winery tours, north and south.
The West is huge! Plan your trip carefully.
Thank you.
We have 16 days. No big cities on this trip. More of a outdoors/nature trip.
And I plan to stop at every winery.:)