I don't know if you're big fan of hiking but you have to go to the Valley of Fire even if you need a scooter. Grand Canyon too!
http://www.travel-photographs.net/images/red-rocks-in-valley-of-fire-nevada.jpg
http://www.lovethesepics.com/wp-content/uploads/2014/03/Windstone-Arch-small-cave-in-the-Valley-of-Fire-State-Park-Nevada.jpg