I agree - the water park in Calis is more geared up for the younger kids. My teenage daughters were a bit bored there last time we went. They spent more time sunbathing than on the slides. We'll have to try the one in Ovacik if its better for older kids.
Steve, when we were over last Summer, the Calis Beach Restaurant was still advertising free tickets for the water park with every full meal. Six of us had a meal (total bill of about 160 lira including drinks) and they would only give us two free tickets for the kids. They reckon the rules had changed! We put up a bit of a fight as the only reason we had gone there in the first place was for the free tickets to the water park, as advertised outside!
Ask (before you buy meals there) what you need to spend to get free tickets. I know we will before we eat there again.