Better phrased... Where is the only..... Well maybe not that bad, but really the Golden Nugget is the only place that comes to mind. There may be some other stand alone places around, but can't remember anything.
Golden Nugget is the best/only place to go downtown. I personally recommend it. You can ask for any cocktail/food/etc item you want while there...they will bring it! Also the girl that does the Mani/Pedi is named Sharon and is a doll!
Mike, Golden Nugget is the only place for a true spa-like experience downtown. Average workout and okay steam/sauna area and I had a good massage there a couple of years ago. My wife and I drove to Chinatown this last trip and got pedis in one of the strip mall nail locatons. Cost was significantly cheaper than at Golden Nugget and the quality was very good. For facials, mani's and pedi's I think Chinatown is a very good inexpensive option. Skip the Chi-town massage...