There are various opportunities to cycle associated with Patonga - here's a few ideas:

Patonga is a good 110Km ride from Sydney and the journey represents a good work-out travelling along the Old Pacific Highway and providing scenic and moderately challenging riding.  One variation on this is to Kick off from Bobbin Head, ride to Patonga and then take the ferry back to Bobbin Head, indulging in fish and chios before boarding.

Locally Patonga sits close to the Brisbane Water National Park and so provides for some options.  This map is issued by the NSW Parks and shows some of the nearby mountain bike trails

Cycling