I hope it's open when you go. We took on our girls into it on a whim many years ago before it got so busy, and it was a great experience. They weren't in dresses (we would have done that if we'd have thought about it beforehand), but my 3 girls absolutely loved being pampered like they were princesses. They were able to choose the hairstyle they wanted, then the girls doing the hair sprinkle them with magic pixie dust, or something along those lines. The hair lasted even into the next day.
How old are your girls? Mine are teenagers so I wouldn't take them there anymore, but if they are younger then they would love it.