Mentioned by Sydney 2 days itinerary
What to do in Sydney in 48 hours: An exciting 2 day Itinerary
"From the eastern side of the Opera House, you have easy access to the Royal Botanic Gardens, in my opinion, one of the most impressive gardens in the world, certainly from a location standpoint. You can’t beat the serenity and harbour views and this is a great place to spend an hour or two in Sydney. Take a walk around the gardens to admire the many different types of plants and city views. You can also take a free self-guided walking tour."