The Duke and Duchess have viewed a surf life-saving display as well as meeting volunteers at the popular Manly Beach in Sydney.
The Dutchess went down onto the beach and watched the performance, acting out a race to the sea front like a life guard.
The Royal couple are currently on their twelfth day of the Duke and Duchess of Cambridge's official tour to New Zealand and Australia.
As Prince George's first royal tour draws to a close after 19 days down under, here's a look back at the highlights of the family's trip.
The Duke and Duchess of Cambridge showed off their street credentials at a community youth centre in Adelaide.
The Duke and Duchess of Cambridge visited the Blue Mountains of Australia, where over 100 homes were destroyed by bush fires last year.