i called about this in October. Availability is very limited. four ladies at a time and two shifts 6 to 8 and 8 to 10, only on Nassau night. I believe the price was around 150.00. It included a message, facial, rain forrest room, champagne and chocolate strawberries, and may of had some other things too, but i can't remember at the moment.
check Barb's site for a september trip report as I know she did this with Nats Mom on the 9/5/02 sailing.