Spas with adults only in Thailand

Bangkok

Walk-in ice bath and sauna studio in Phra Khanong with a beginner class, private suites, and day passes from 490 THB, open daily 9am-9pm.

Phuket

Adults-only Ayurvedic resort on a Rawai hillside with doctor-led Panchakarma programs, a saltwater pool and 47 private villas.

Chiang Mai

A contrast-therapy day spa in Hang Dong, Chiang Mai, built around a wood-fired sauna, herbal steam room, ice bath and pool, with a 500 THB day pass.

Koh Samui, Surat Thani

An adults-only day spa in Bo Put, Koh Samui, with sauna, steam room, hydrotherapy pool, ice bath and a healthy-food restaurant, open daily 8:30am-10pm.

Koh Samui, Surat Thani

Kamalaya Koh Samui is an adults-only destination spa and wellness retreat on Laem-Set Rd with over 100 treatments, thermal circuits and multi-day health

Bangkok

A late-opening onsen-style bathhouse on Sukhumvit in Bangkok's Khlong Toei district, open to walk-ins daily for adults only.