These photos are from the Red Rock Canyon National Conservation Area just outside of Las Vegas, Nevada. This is a beautiful area to visit and highly recomended when in southern Nevada. However, if choosing between Red Rock Canyon and the Valley of Fire State Park, I would choose the Valley of Fire State Park.
Red Rock Canyon National Conservation Area
Joshua Tree
The Wilson Cliffs
Calico Hills
Aztec Sandstone in the Calico Hills (Note the people for scale)