Here is the Google sat photo location for the Morisett Showground:
http://maps.google.com.au/maps?f=q&h...502629f9c2d2e7
If this doesn't work for you just type "Morisett, NSW, Australia" into Google Maps and switch over to the satellite photo then you can zoom in on the Showground and the access roads from the Sydney Newcastle Freeway.
If you open Google Streetview you can see the entrance, and the ground level view.
Have a safe trip.
GD