[Kimbo]

The track has two entrances basically on opposite sides. The main entrance is near the grandstand on the main straight side, the other entrance is at the rear of the track (near turn 5) next to Sydney Dragway pits.
Unfortunately, the hill along turn 1/2 is probably the furthest point from the toilet facilities. If you would like to be closer to facilities, the grandstand (I think it is free) or somewhere in the second half of the track is the go.

Kim