Hiking trails lead to the 1,267 m summit.
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御岳山
This 929 m mountain is famous for the mountaintop Mitake Shrine. If you don't want to hike up the mountain, a ropeway and bus service cover most of the distance between the shrine and Mitake Station on the Ome Line. On a clear day you can see all of Tokyo as well as Nikko's peaks to the northeast. From the mountaintop there are trails, some quite strenuous, that can make for a good half-day of hiking.
御前山
Hiking trails lead to the 1,405 m summit.
もえぎの湯
A hot spring that features views of the Tama River valley.
奥多摩湖
Located behind a large dam on the Tama River is the largest lake in Tokyo. The western end of the lake extends into Yamanashi. Regular buses are available from Okutama Station (20 min). There's also a mostly gentle 9-km hiking trail called the "Mukashi-michi" (昔道, "old road") that can get you there in about 4 hours.
日原鍾乳洞
Full of stalagmites and stalactites, can be reached by bus.
東京サマーランド
Big pools complex with many attractions.