Photo above: The steam room at Kamalaya health resort in Koh Samui, Thailand. These health retreats were targeting longevity long before it became a buzzword. Yes, you’ll be pampered—but you’ll also receive an onslaught of diagnostics and be subjected to a rigorous diet and treatment regimen.Sha Wellness Clinic MexicoRiviera MayaSHA MexicoSHA Mexico signals its seriousness…