Yes, it is part of the Grand Ucel Hotel where we stayed last week. Absolutely amazing. Have some photos so will try and post them or PM me. It is free to people staying in the hotel and is also open to the public but not sure how much they charge.

Thanks for the info.
I've found the hotel website and states free entry for all guests in 2006.

http://www.granducel.com/

The photo album page shows larger pictures of the Aqua park if you click on the thumbnails.

For 2007 it states:

"Free entry for all summer 2007 bookings made by February 2007;
75% discount for all bookings made by May 2007;
50% Discount for all guests."