Ask any woman where she'd most like to spend a day and you'd probably hear the word "spa" repeated over and over again. And why not? After all, spas are where we go to restore our souls and bring equilibrium into our chaotic lives. They are the very essence of "serenity now". Not all spas are created equal though. Take Fern Tree Spa at Half Moon for example. (You can find my review of Half Moon as a luxury family destination here) Fern Tree is Jamaica's largest spa at 68,000 …