Expect over-the-top adventure when you travel down under on a Holland America Line cruise to Australia. You can scale the Sydney Harbour Bridge, meet Tasmanian devils in Port Arthur (or ghosts in Hobart!), ride camels on Cable Beach in Broome, and hop a helicopter in Melbourne for a flight down the Yarra River Valley. Other wow-worthy moments on your Australia cruise: trekking through the planet’s oldest rainforest in Townsville, and snorkeling the Great Barrier Reef during a call in Cairns.