I am in need of some pampering and have heard Thailand Spa hotels are the best. Any suggestions?

Take your pick.

Anantara Spa Koh Samui
The Peninsula Spa
Banyan Tree Spa
Chiva-Som International
Health Resort
Sivara Spa
The Spa at The Chedi
COMO Shambhala
The Spa at Four Seasons Chiang Mai-(my pick)
Dheva Spa
Oriental Spa