Sumata Valley (寸又峡) is located south of southern Japanese Alpine, in Shizuoka. It is very popular spot for mountain hiking, especially during the Koyo season, Autumn. It has 16 km long, and there are many bridges which gives you great view of the valley. It has also great Onsen which is great for a skin care.
Tourist Info.
There are parking and public restroom.
Access
0. at Shizuoka Station.
1. use JR Tokaido Line to Kanaya (32 min.)
2. use Oigawa Line to Senzu (60 min.)
3. use Minami Arupusu Abuto Line to Okusen (30 min.)
4. use Bus to Sumatakyo Onsen (30 min.)
1 hr. 30 min
New Wave Samurai Movie. 
映画好き集まれ！ 
Yume no Tsuribashi is one of the main feature of Sumata Valley, and it has 8m high and 90m long. You can enjoy walking in the air and great view of Sumata Valley. There are many hiking courses which take about 60 min. to 90 min. From the February to November, there are many kinds of flowers and Koyo you can enjoy.