JEF, as you are coming into Gosford on the main road in, about 750metres back from the ground, (KFC on your left) on your right hand side of the road, they used to make available a large open area for parking. A traffic control dude was usually there waving people in. Keep an eye out.
Once parked there, its a short walk through park to bridge and the ground. Its damn dark so if you have kids with you like I did, take a torch.