Zip over the waves in the high-speed Eco Express, circling the whole of rugged and remote Rottnest Island. Cruise over the cerulean waters as you pass quiet bays and watch for native wildlife. Dolphins, quokkas, and birds from rock parrots to turquoise sacred kingfishers all thrive here.

Head to the pier and step aboard a comfortable, ocean-going ferry for your ride out through the Swan River and across a channel of the Indian Ocean to Rottnest Island. This sandy outcrop off the coast is rich with heritage and history and full of wildlife, from swooping seabirds, fur seals, and dolphins to adorable, miniature kangaroos called quokkas.

At the jetty, switch from your larger ferry to the more compact—and much faster—Eco Express. This high-speed vessel zooms over the waves at a brisk clip of 43 knots per hour, so hold on tight. During a thrilling 90 minutes, circumnavigate the whole of Rottnest Island. You can admire its secluded beaches and rocky coves, watch for pods of whales in the distance, and ride past the historic lighthouse on the West End.

As you cruise, look down—the warm currents here create an ideal haven for coral gardens, and the turquoise waters are teeming with colorful tropical fish. When your boat pulls back in to shore, disembark and enjoy free time to lounge on the white sand beaches, snorkel and swim, or trek along coastal trails before your return ferry to Perth.