To be honest, I am not aware of any such designation on a large scale. There are over 10,000 spas in the U.S. and no one has been to all of them or able to rate them in terms of quality. There is no easy way to conclude the level of a spa's service. In fact, sometimes quality comes down more to an individual therapist than it does a facility.
I think a good place to start for a newcomer is with a Swedish Massage and a facial. These are still the most favorite spa treatments because people love them. Although there are many wonderful treatments on most spa's menus, such as hot stone massage, Ayruvedic treatments or even body scrubs and wraps, I would not recommend them for the first time spa-goer.
There are many ways to de-stress and spas specialize in this. Exercise is an excellent de-stresser. Bathing in hot water is a de-stresser. Massages are for many the ultimate de-stresser. At spas people typically leave their outside world behind, they slow down and their bodies become more relaxed. A spa has nurturing staff and there is lovely food that doesn't intoxicate but rather revitalizes. I think that what spas do is help us get back to who we really are and connecting at that level is always romantic.
Truly the best way to identify romantic spas is to consult the romantic/honeymoon spa category on www.spafinder.com. There are almost 50 romantic spas listed. Spa Finder's mission is to connect people with their ideal spa experience, and we also present spas in 20 other categories such as: weight loss spas, spas for horseback riding, hiking spas, spas for yoga, etc.
They are open for invitations from romantic destinations and hospitality properties in the USA, What Do You Know About Spas? by Norm Goldman, Editor of Sketchandtravel.com & Bookpleasures.com
I have read that the destination spa concept is evolving as some brands expand their product through other outlets. Could you give us some examples and explain why this is taking place?