Some of my experience ..... I had my honeymoon in sidney. We drove to Port Stephen and then to blue mountain. The journey from Port Stephen to Blue mountain driving was really a challenge. We stayed there for 2 nights. The scenery is damn beautiful. You can't find it in anywhere in the world. Try not to stay too late as the nightfall early and since it is a mountain, fog tend to be thick at night and we were really like driving like a blind. Enjoy your stay there. Cheers.