There is NO need to buy tickets for optionals (Scenic World, Sydney Zoo) in advance.
You can purchase them on the day of the tour from the tour guide by cash or by credit card.
This is our recommendation for the following reasons:
1 You will not need to line up behind other customers (when you buy online you still need to line up to collect tickets).
2 You will not choose incorrect time slot (we do not visit all places at the same time every day).
3. You will not get separated from the group (which can happen when you line up for tickets individually).
4. You will not get a refund in case of adverse weather (whilst when buying on the day of the tour will enable you to decide when you arrive there).
5. The price of the tickets when buying from the tour guide is the same as it is online (and sometimes cheaper!).