Please take a look at http://4travel.jp/traveler/airpentaro/album/10398206/ for details of this walk (in Japanese)
 
Meet at the JR Ohme Line’s Okutama Station’s Ticket Gate at 10:00AM.  From Shinjuku, take the JR Holiday Special Rapid Okutama#5 (going to Okutama) at 8:19AM.  This arrives at Okutama Station at 9:54.  Be sure to arrive on this train as we will be unable to wait for the next one.
 
Please wear appropriate shoes (tennis shoes, hiking boots), bring a lunch to eat on the mountain, and plenty of liquids.
 
Course (from Okutama Station): Okutama Station – Shidakura Suspension Bridge – Old (Therapy) Road – Okutama Lake – Okutama Station (by bus – 15 minutes)
 
Walking Time: About 5 hours