Giant Gap is a section of the North Fork of the American river where you get to ride mostly Class IV and three challenging Class V rapids and dive into calm crystal clear pools in between. To reach the river requires a 2 mile hike down and into the canyon. Rafters have either rolled up their raft with the paddles and pump inside or wheeled it down on a foldable trailer. As you make your way down river the canyon walls begin to close in and become wide enough just to fit a raft through. With that said, once you put in there's no taking out. The steep sided canyon walls make it impossible to climb up.