CLIMB Works Keana Farms is a guided zipline canopy tour on a working farm in Kahuku on Oahu’s North Shore. The roughly 2.5-hour tour includes a UTV ride, dual ziplines, suspension bridges, elevated boardwalks, rappels, and fresh farm produce sampling. Tours are fully guided from start to finish. Note: Children ages 5-14 must be accompanied by an adult on the tour; weight limits apply.