Went over the weekend, and found the place.

It is exit #29 on Salwa. Go over the flyover and thru the round-a-bout and then turn left. Dont get back on the highway, it is the service road beside the Hwy.

The entrance to the park was under contruction, so we couldnt find a way in, but we thought it might be possible to use an entrance near the Military entrance, as we could see cars parked at the aquapark.