There are numerous look out points along the rim of Bryce Canyon National Park. Inspiration Point is a favorite.
Zabriskie Point in Death Valley National Park is one of the best views in all of America. That's Manly Beacon and the Panamint Mountains in the background and the badlands in the foreground.
In the fall when the Merced River is running low, Valley View in Yosemite National Park, CA provides a colorful spectacle of the river, El Capitan, and Cathedral Rocks.