Grand Canyon, Jeep tour of Sedona, all the canyons, old volcano, the space observatory, Petrified Forest, and Painted Desert. Watching a thunderstorn roll in over the Grand Canyon was really cool - it was a short one, and right after we saw a waterfall start down below.
Quick Tips:
It's hot in the summer. They say it's a dry heat, but Hot is Hot. Bring plenty to drink during your excursions. The Jeep tours in Sedona are a must. Also we did a guided tour to the Grand Canyon, which was nice but I think next time we'll do it on our own.Best Way To Get Around:
Rent a car and be prepared to do a lot of walking.