Since you will have the car for 10 hours, we have created quite an extensive road trip for you. It’s about a 5.5-6hr drive. So with stops along the way should be able to make some decent stops along the way.
Start on the highway to Bowral so you can get the feel of the car and experience Sydney’s maximum legal speeds. Once you hit Bowral (maybe a quick stop for morning tea or early lunch), this itinerary swings towards the coast with a stop at Berry. Time for a lunch break or savour their famous donut truck.
Finally hit Sydney’s beautiful coastline roads, maybe pause at Scarborough Hotel or one of the lookouts (Otford lookout is our favourite!) before experiencing the thrills of the winding roads in the National Park.