Hi Jacki, You can book a Turkish Bath/Massage at Club Atrium (No. 47 on map). You don't have to be staying there to use the facilities. Just go into reception and speak to the Customer Care people, either Lorraine or Mustafa, who will book you a time. There will be only you (and whoever you are with) in the Turkish Bath which is lovely.
I went to one of the public baths a couple of years ago and it was heaving with people. The wait was about 2 hours, the turkish bath about 2 minutes. We were well peeved as you an imagine. The one at Atrium is a lot better. Cost was about £10 then but probably a little more now.
When I was there in May this year, I booked the massage only. It cost £18 for a full body (one hour) massage. Absolutely lovely. Very relaxing.
Have a great time (I'm sure you will).
I'm flying out again on Monday - can't wait