If someone asks me, "Where is the most beautiful place in the mountainous areas of Japan?" I will immediately say "It is Kamikochi (Nagano Prefecture)". The beauty of Kamikochi can not be expressed very much in photos or videos. In Kamikochi, there is the finest resort hotel in Japan, the Kamikochi Imperial Hotel. The view of the mountains from the balcony of the room is excellent. It will be a wonderful memory to stay in the hotel and hike around.
For details on Kamikochi, please refer to the following article.