With the number of spas in the U.S. more than doubling between 2000 and 2004, many are adding innovative perks and loyalty programs to boost business. For example, at Canyon Ranch, with locations in Tucson, Ariz., and Lenox, Mass., guests can get an upgrade for booking their next stay during a current trip. And the Golden Door, in Escondido, Calif., asks guests to write themselves a letter describing life goals they wish to achieve in six months; the letter is mailed to them half a year later.

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