Japan alps is on the main island of Honshu and it passes through 6 cities.
It can be a case of too many options, so hone in on a handful. The Kamikochi Valley offers a range of shorter, less technical walks to suit most hikers. These include short three to four hour treks to Myojin-ike, as well as more challenging ascents of the local mountains such as Yariga-take (3,180m) and Hotaka-dake (3,190m). Kamikochi itself is a lovely resort set in the Chubu Sangaku National Park, so if you're here in spring or summer, check in for an open-air bath at the Kamikochi Onsen Hotel next to the river - the resort is closed between November and April.
It's located in between Kanazawa, passing though Toyama and Takayama.
I've compiled a list of hiking trails for experienced and non-experienced hikers in the different regions of Japan. (75% of Japan is mountainous)