A small boat cruises through vibrant turquoise ocean waters off a sandy coast with a white lighthouse in the background, Rottnest Island, Western Australia. © Tourism Australia

Rottnest Island, Western Australia © Tourism Australia

An aerial view shows a red tour boat anchored in bright turquoise waters near rocky limestone cliffs, Rottnest Island, Western Australia. © Tourism Australia

Rottnest Island, Western Australia © Tourism Australia

Golden morning light spills across lush hills and a calm bay, with the InterContinental Hayman Island Resort in the foreground, Hayman Island, Queensland. © The InterContinental Hayman Island

Hayman Island, Queensland © The InterContinental Hayman Island

A small group of walkers strolls along a sandy beach near sea lions lounging on the shoreline under a vast blue sky at Seal Bay Conservation Park, Kangaroo Island, South Australia. © Tourism Australia

Seal Bay, Kangaroo Island, South Australia © Tourism Australia

Sunlight reflects across a resort infinity pool lined with tropical palm trees overlooking calm ocean waters and distant islands, Hamilton Island, Queensland. © Tourism Australia

Hamilton Island, Queensland © Tourism Australia

Aerial view of white sand beaches and turquoise reef waters fringed by lush green hills, Lizard Island, Queensland. © Lizard Island

Lizard Island, Queensland © Lizard Island

Water ripples gently in a tropical resort pool bordered by soaring palm trees and luxury Balinese-style thatched villas, Makepeace Island, Queensland. © Makepeace Island

Makepeace Island, Queensland © Makepeace Island