Canyoning

Canyoning, or shower climbing (sawanobori) as it is known in Japan, is travelling through canyons by hiking, jumping, climbing, abseiling and swimming. And sliding - canyons make excellent natural slides. In its most pure form, canyoning requires technical rope and navigational skills.
Toyama
Toyama Prefecture is located on the sea of Japan, separated from Gunma by Nagano. Here you can join an experienced canyoning guide on an exciting adventure down the Kurobe River, accessed from the Unazuki Snow Park Nakajima Ski Center.
Gifu
The Jinzu River can be accessed from Michinoeki Skydome Kamioka, located in Hida City close to Gifu's border with Toyama. Both this tour and the Kurobe River course above are run by J-Wet Adventures.
Shizuoka
Hamamatsu is located just 90 minutes from Tokyo and 30 minutes from Nagoya by bullet train. From there you can head into the northern reaches of this geographically expansive city to descend a mountain stream in a valley close to the river source. Natural water slides and diving into a waterfall basin are big parts of the fun.
Okinawa (Iriomote Island)
Iriomote Island is Okinawa's second-largest island. Located about 200 kilometres (124 mi) east of Taiwan, once you're on this remote island you can make your way to a waterfall by canoeing through mangroves and trekking in the jungle, then feel the excitement of canyoning in the tropics. Tours are operated through a Kazaguruma Shop in the town of Taketomi.