Hi all! We are booked on adult only Southwest Splendors in late Sept.-early Oct. Can't wait since I have never seen the Grand Canyon. I need to know about the ATV trip. It sounds wonderful and we love adventure, but DH has had back problems in the past. How rough is the ride? I would hate to ruin the rest of our trip because of one bad choice that causes him a problem, but I also hate to miss out on a great experience. He does have an ATV at his hunting camp and rides it all the time, but it is not very rough terrain.