It's about half way along the front to the Ataturk statue, we normally get the water taxi and ask to get off on the landing stage near the waterpark which is about 100-150 metres walk away, you can't miss it as you will see the slides.
When leaving turn right our of the water park and first right, at the top of the road there is a taxi rank or you can catch a dolmus on the main road.
Have a look at the google maps link below, this will give you a better idea of the location. I have marked it with an 'A'
http://maps.google.co.uk/maps?q=36.8432 ... 48666&z=15Dave
edited to change can to can't