If you wish to enjoy a green maple leaves in Kyoto, Jingo-ji (神護寺) temple is the place to go. Due to its remote location from the city center, and the congestion with many sightseers in this season, not many Kyoto residents visit this temple. However, it's still the best spot to spend a relaxing time viewing the fresh greenery of maple leaves.
Jingo-ji, established in the Heian (平安) period, is also very famous for its treasure, "the portrait of MINAMOTO no Yoritomo (伝源頼朝像似絵)", which can be seen on school textbooks of Japanese history.
During the Jihoh Mushibarai (寺宝虫払, airing for insect damage prevention of temple's treasures) event annually held from May 1st to 5th, the treasures are open to the public. It is truly a rare chance to see Japanese national treasures in a close distance.