When searching for a good beauty spa, don't just look in the Yellow Pages -- check the Internet, too. These days, the Internet is as good a source for local spas as the phone book, and sometimes better -- at some sites you can read reviews from others who've tried their services.
While shopping for a beauty spa, you should always note the atmosphere: is it relaxed and friendly, or does there seem to be an undercurrent of tension? Since the whole point of a spa is to relax and enjoy yourself, you may want to avoid any spa that just doesn't feel right.