I almost always use this day spa after my hikes around the area. It can be a bit crowded depending on the time of day but you get Mt. Fuji view even from the outdoor bath.

About:

Yamanakako Onsen Benifuji no Yu hot spring is a must-visit spot for those looking to relax and unwind with stunning views of Mt. Fuji. With outdoor baths offering a glimpse of "Red Fuji" during winter mornings, this onsen provides a rejuvenating experience for tired muscles and aching bodies. Renovated in 2015, the facilities include indoor spa baths, a steam room, and a massage room, making it a perfect place to soak, chill, and enjoy the therapeutic benefits of natural alkaline hot spring water.