Mt. Yudono
One of the trio of Dewa peaks, 5,000-foot Yudono-san is generally the last on pilgrims' rounds. You can descend on foot in a few hours from Gassan, but it likely involves reading signs in Japanese, a bit of exertion, and slippery metal ladders, and you'll want to check with the tourist information folks about current conditions and the bus schedule. Very limited bus access allows you to make the 80-minute (¥5,000) run on weekends and holidays between Tsuruoka and Sen-nin-Zawa, a trailhead for a short climb to the summit, where you can make a small monetary donation and be purified in a secret ritual that you are forbidden to photograph or tell anyone about. Once cleansed, don't miss the last bus back down to Tsuruoka, which leaves at 5:20 pm. There is a Tsuruoka shuttle bus for tourists only in July and August that makes the trip; another summer bus does as well, but it is not an easily accessible spot.