Carrie Coolidge of The Luxist Awards recently compiled this list of the world's best spas.
MY favorites are as follows:
Best Day Spa:The Spa at The Grand del Mar
Best Green Spa:
Truly, any of the Green Spas listed in the article are worthy of the name "best".
Best Extended Stay Spa:
Best Men's Spa:
Best International Spa:
Let's be real here, any of these are wonderful, though, I am most familiar with Tabacón Resort.
Enjoy.....even if you simply read about them ;o)