Coasters Retreat is an enclave within Ku-ring-gai Chase National Park, on the western shores of Pittwater looking northward toward the Basin.

Coasters Retreat has no road or land access and is entirely dependent on transport via the Palm Beach Ferry Service.

Pittwater was first explored by Governor Arthur Phillip in 1788, who named it after British Prime Minister William Pitt.

In 1914 Bonnie Doon Wharf was built by the Ku-Ring-Gai Chase National Park to provide access for campers and visitors.

Electricity lines were hidden underground, road building never initiated, fences not allowed, and communal postal services maintained in order to promote a tranquil non-suburban environment.