Transportation options include flights, rental cars, and yacht charters. Domestic flights can range from $100-$300, car rentals start at $20, and yacht charters range from $500-$1,000 per day. Keep in mind that Australia is a vast country, and travel times can be long, so consider these factors while planning your itinerary.
If you have more time, consider a visit to Western Australia to see the famous Wave Rock or explore the Pinnacles Desert. On the other hand, if you have less time, consider cutting down the itinerary or staying longer in Sydney. And, don't forget to add some buffer days for unplanned events or delays due to weather.