Located deep in the Chichibu Tama National Park, the closest national park to Tokyo, the area is green in summer, blanketed with flowering cherry trees in spring and home to hundreds of maple trees that display a riot of autumn colors each fall.
(https://www.gotokyo.org/en/spot/53/index.html/GO TOKYO The Official Tokyo Travel Guide)
Lake Okutama has a water storage capacity of 185.4 million cubic meters. Providing 20% of the water used by the people of the city, it is one of Tokyo's most valuable resources.
(Source: Okutama World /Okutama Town Sightseeing Section)
3 hour (approx.)
Approximate Transportation Expenses
▷by buses - - - JPY ¥1,000 /person
▷by taxis - - - JPY ¥5,000 /taxi
▷by a chartered vehicle - - - JPY ¥7,000 /hr