Don't miss one of Japan's best whitewater rafting experiences, with more than 7.5 miles (12 km) of Class III to IV rapids. This half-day rafting tour in Minakami is a continuous roller-coaster of whitewater action, plus the scenic canyon sections of Momiji Canyon, Minakami Canyon, and Suwa Canyon. It's most active in the spring; the summer tour is a mellower experience with less challenging rapids but still plenty of fun both in and out of the boat.