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What is it? Yunomori Onsen and Spa hides inside a nine-storey building near Sathorn, blending Japanese onsen culture with traditional Thai massage. The setup spans multiple floors with hot spring baths, spa treatments, a restaurant and a cafe all under one roof, staying open until midnight for office workers needing a late wind-down.
Why we love it: The exterior looks pretty ordinary, but step through the doors and the whole vibe shifts immediately. Inside feels genuinely Japanese with white walls, natural light filtering through and real wood furniture adding warmth throughout. Everyone changes into woven sandals and a yukata before entering, which helps you switch off from the outside world. The onsen zone splits into separate male and female sections with plenty of variety including hot bath, soft bubble bath, silk bath, mineral water bath, deep cold bath, steam room and sauna. Day passes run B450 and let you stay as long as you fancy, making it brilliant value if you want to spend a whole afternoon cycling between different baths and treatments. Yunomori also makes an appearance just off Rama 4 (Sukhumvit soi 26), as well as an especially large and semi-outdoor venue in Pattaya.
Time Out Tip: You can't wear your own swimsuit from home. It has to be their provided mesh sets or nothing at all, so don't bother packing yours.
Sathorn 10, Soi Suksawittaya. Open daily, 10am-midnight