One of the top five most fun things I have ever done!!! The ATVs were fabulous on their own (I had never been on one), but zooming through the desert, nearly no one else around, with jaw-dropping scenery at every turn... can't beat that! The Subway lunch at the top of an antique barn, overlooking the canyon, was also amazing. Everything about this experience exceeded my expectations, even after reading glowing reviews beforehand. My two tips for the ATVs that I wish I had known:
(1) Bring gloves. I got blisters. Still worth it though.
(2) Bring a water bottle with a built-in straw. They did provide commercial bottled waters, but you can't drink from them (other than super-awkwardly) through your helmet. It would have been easy if I'd had a straw. You can always refill your bottle from the ones they provide.
Sign up for this experience. Do it now, you won't be sorry!