Actually, this sport is called Canyoneering in the USA or Canyoning in Europe. Alot more than just rapping on rope. Problem solving, climbing, downclimbing, swimming, wading, hiking, anchor building, route fingding, etc..... one of the most diversed sports around. ZNP is a cool place, but there are other places in Utah (Robbers Roost, Swell, North Wash, Poison Springs, Lake Powell areas) that I think are cooler, more squeezing/phyisical canyons, clothes/gear get tear-up pretty easy, lots of fun.