The author tested an overnight stay in a motorhome at an RV park at about 1,000 m elevation and confirmed that air conditioning is not necessary in midsummer. Recommended locations accessible from the Tokyo metropolitan area include Karuizawa (Nagano Prefecture), Nasu Plateau (Tochigi Prefecture), Lake Yamanaka (Yamanashi Prefecture) and Tsumagoi Village (Gunma Prefecture). Weather and humidity risks were noted, along with the need to check overnight parking locations in advance and follow etiquette.
