Gooong! That's a subtle hint to chatty spa-goers to shush, restoring meditative silence to Japantown's communal, clothing-optional bathhouse. Salt-scrub in the steam room, soak in the hot pool, take a cold plunge, reheat in the sauna, rinse and repeat. Men/transmen and women/transwomen alternate days except all-gender Tuesdays, when bathing suits are required. Bath access is $15 with spa treatments, including shiatsu massage.
Plan on two hours minimum for a leisurely bath experience, plus a wait at peak times. Book treatments and bath access online, and arrive promptly - after 15 minutes, you'll be wait-listed. During off-peak weekdays, you can just show up, add your name to the wait list, and browse Japan Center until they text you that there's an opening.