If you choose this spa from literally hundreds in this area, you won't be disappointed at all. Nice decor and zen-like atmosphere.
Official website http://www.baandalahmindbodyspa.com/
Address No. 2 Soi Sukhumvit 8, Sukhumvit Road, Klongtoey, Wattana, Bangkok 10110, Thailand
Coordinates 13°44'23.626" N 100°33'21.329" E