I've been to the West Riverside open-air bath in Kusatsu-machi several times, and it's always a really fun experience. There's no place to wash up, but it's so huge and open that the feeling is amazing. It is definitely my favorite day spa in Kusatsu.

Only on Fridays, the bath is mixed, allowing everyone to enjoy the experience together.

About:

Nestled in the scenic beauty of Kusatsu-machi, Japan, this bath offers a relaxing retreat with its natural hot springs and serene surroundings. You can soak in the warm waters of one of Japan's largest outdoor baths, surrounded by lush foliage and picturesque landscapes. Despite the lack of shower facilities, the refreshing and liberating onsen experience in nature makes it a must-visit spot for relaxation and rejuvenation.