the national parks make few concessions to tourists. visitors are warned of the dangers, but they are expected to look after themseves and be self-reliant. there is no cable car to the floor of the Grand Canyon, and no motor road. The only way of getting to the bottom is to follow a rough track down the precipices on a mule or on foot. the shortest trail is seven miles long.
they frequently have to rescue inexperienced climbers stuck half way up a mountain rock face. then there are some backpackers, who in midsummer walk with their packs on their backs to the bottom of the Grand Canyon without enough water, regardless of the warning that the temperature is many degrees higher on the floor of the canyon, one mile down, than it is on the rim.