We like Yugawara maku iwa (湯河原幕岩)
Björn Buckwalter
Great winter bouldering area with boulders spread on a sun-soaked hillside in Makuyama park. Easy access with the Tokaido line+bus. The only drawback is that the rock is pretty sharp.
Hideo Suzuki
Christian Fredh
Close to Tokyo, many and good climbs.