Can anyone suggest a really good spa hotel in the US?

I would like to take my 14 year old daughter to a really relaxing spa hotel which will pamper us and give us good memories. Hopefully not too expensive. I heard there some good ones in Arizona. I would love to hear your suggestions and comments. Thanks!

You said Arizona, so I researched Arizona for you. The 1st site is a directory, the other 3 are actual resorts in different cities. Hope this helps!