Leaving Sinajina bonsai shop in Jiyugaoka, I stopped recently at Okusawa shrine. Jiyugaoka is a very pleasant residential neighborhood, with many free-standing houses and gardens.
This shrine is an incredibly peaceful and magical oasis: mature trees, a beautiful structure, and, apart from the two friends I was with, not a person was visible. It amazes me that beautiful green spaces in Tokyo can be open to the public without guards or attendants, and still remain pristine and inviting.
Tokyo Green Space 