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 google map below includes pins for the campsite, hotsprings, supermarket, and a scenic hiking spot next to the Tenryū Gorge (天龍峡).

Campsite Website: https://www.lake-oogute.club/

Google Map: