Ofuro no Osama Hanakoganei

16 baths and saunas of all sizes, including seven with natural onsen water, await at the Hanakoganei outpost of Ofuro no Osama. Part of a Kanto-wide chain of 'super sento', this one can be enjoyed for a mere ¥880 on weekdays (¥1,080 on weekends and holidays) – as long as you sign up for their membership system (a one-time registration fee of ¥100 required). The open-air area features a hot stone bath where you can lie down and look up at the stars while warm water runs down your back, and a comfy steam sauna sure to satisfy even less experienced onsen-goers.