Time Out says
Located to the west of Tokyo, the area surrounding Mitake Gorge is a particularly popular destination with hikers between mid-October and late November. Get off at Mitake Station on the JR Ome Line and stick to the walking trails along the river banks. Postcard views of vivid red maple leaves and yellow ginkgo trees await, and for the perfect shot, make sure you have in your frame the majestic bridge that presides over the crystal clear Tama River. Do visit the nearby Gyokudo Art Museum for classic Japanese paintings before making the trip back to town.