This is truly one of the best spas in Bangkok for an over-the-top spa session that goes well beyond a massage. Their signature treatments include The Heavenly Nantha Garden Experience, a 2.5-hour bath, scrub and massage that combines Thai, Ayurveda and Shiatsu techniques; The Harmony of Tad Si, a treatment using Thai herbal compresses and aromatic oils to relax muscles and pressure points; and the Kenya Sensory Journey, a skin-rejuvenating body scrub, wrap and oil massage with native herbs and plants.