Starting amongst ancient petrified sand dunes we hike our way downhill to a dry sand and rock wash. Quickly the wash disappears over an edge, plunging into the depths of a hidden chasm. "We go down there?" is the usual question after peering over the edge, and indeed we do! This exquisite rappel is the first obstacle in reaching the entrance to the amazing Grotto. Now, almost totally enclosed in a small stone room, we exit to find our next challenge; an incredible rappel into an alluring green canyon below via an enormous natural stone bridge! Detailed rappelling instruction and a back-up safety system allows even the first-time canyoneer a chance to experience this exciting activity. Insights into the geology, plant life and natural history provide a depth to your adventure. A cool spring-fed stream accompanies us for the rest of this outstanding and informational hike.