Embark on a whale-watching cruise from Sydney's Circular Quay. With over 20,000 Humpback whales swimming from sub-Antartic waters to the Great Barrier Reef, Sydney is a prime place to watch this natural phenomenon. Spot whales showing off their antics, including breaches, tail slapping, and maybe a close-up wink when they are feeling extra curious. You may even see dolphins, seals, and birds as you cruise past Sydney's landmarks.