This is an easy camping trip from Tokyo to Lake Ōguteko Camping Ground
(おおぐて湖キャンプ場) in Nagano Japan. The campsite surrounds the entirety of this beautiful little lake and is a perfect spot for anyone looking to relax in nature for a few days. The link below includes google map pins for the campsite, onsen, supermarket, and a scenic hiking spot next to the Tenryū Gorge (天龍峡).
AloJapan.com