The park was opened by the Premier of Western Australia, Ray O'Connor, and the chairman and president of the Tokyu Corporation, Noburu Gotoh.

In his opening speech Gotoh explained that Atlantis was the first element in an expansion plan to make the Yanchep Sun City a premier leisure recreation region.

[5] Prior to the park's opening, seven bottlenose dolphins were caught from the local coastal population and were used as performance animals for the next ten years.

[9] A large limestone sculpture of King Neptune by American sculptor Mark Le Buse that originally overlooked the park remains a major landmark in the suburb and is often factored in any future redevelopment plans.

[11] In January 2023, the Sun City precinct, which encompasses the former site of Atlantis Marine Park and the King Neptune sculpture, as well as Two Rocks marina and shopping centre, was added to the State Register of Heritage Places in recognition of Sun City's place as the state's first private residential, commercial and recreational investment project.