You can’t possibly come to Thailand and not experience a Thai massage or visit a spa for a matter of fact! Prices are extremely reasonable here and you don’t have to pay tourist prices if you know where to go. I love a good massage and am extremely picky about where I go. Here are a couple of places I recommend:
Asia Herb Association is a Japanese owned massage/spa chain with 2 outlets on Sukhumvit soi 24 (just walking distance from Phrom Phong BTS) and another on Suk. soi 31. Their massuers are well-trained and price is quite reasonable at 350 bht per hour (it used to be 350 bht for 90 mins but prices have gone up since) and currently, 450 bht for 90 mins. Very popular with Japanese and tourists. Advance booking is adviced. Tel: 02261 7401, 02260 8864. Please check with the operator as to which outlet it is you are calling as they have 2 outlets on soi 24.

The other very popular spa is Health Land. Frequented by locals and tourists alike. I do believe prices are cheaper and have common as well as private rooms. The common rooms are seperated by drapes but still quite private and clean. Prices start at 250 bht for 2 hours (at least that used to be the price 3 years ago). Check out their website for outlet locations. www.healthlandspa.com