We are considering a trip with two kids (ages 8 and 12) in mid-July. We'd leave Salt Lake City early on Day 1 and arrive in Las Vegas late on Day 9. I had not realized how many amazing parks were packed into drivable range until reading through these forums. Now I want to see them all (Arches, Canyonland, Mesa Verde, Monument Valley, Grand Canyon, Zion, Bryce) but realize it isn't reasonable for the time we have. Any thoughts on the must-sees and what we should cut? What itinerary would you recommend?