For the ultimate spa experience in Koh Samui, head to 'Sala Spa'. It's hands down the best massage we've ever had! Sure, it's a bit pricey, but trust us, it's totally worth every penny. We went all out with the 'pamper me' treatment for 150 minutes, and let me tell you, it was pure heaven!
Btw, I don't have many pictures of this spa because when I'm there, it's all about zen mode - no cellphones allowed!