I must say I think this part of the trip was MOST fun! these dunes are gigantic and the guys driving these SUVs have obviously spent A LOT of time here. We went across dunes nearly 100 feet tall and zig zagged down the other sides, on the flats we were flying at over 100 MPH then back into the deep sands and those tremeandous dunes. Dropping off the other sides would lift you out of your seat (thank God for seatbelts!), I really wish my son could of been here to experience this!