Rottnest Island carries two names. The Whadjuk Noongar people called it Wadjemup — "place across the water" — long before Dutch captain Willem de Vlamingh landed in December 1696 and mistook the resident quokkas for oversized rats, christening the place 't Eylandt 't Rottenest. The rodent was a marsupial. The name stuck for three centuries. The island sits roughly 19 kilometres west of Fremantle, a limestone platform 11 kilometres long and 4.5 kilometres wide, ringed by 63 beaches and 20 bays. Sea levels severed it from the mainland around 7,000 years ago, isolating a quokka population that now numbers between 10,000 and 12,000 — the densest concentration anywhere. Their tameness is a product of that isolation: no foxes, no cats, no dingoes. Travellers researching the rottnest island bus tour cost are usually pricing access to a landscape that has no through-road traffic at all, since private vehicles have been banned since the island opened to the public. That public opening followed a darker chapter. From 1838 to 1904 the island served as an Aboriginal penal establishment; nearly 4,000 Aboriginal men and boys were imprisoned in the Quod, the octagonal cell block still standing at Thomson Bay. At least 373 died there. The Wadjemup Aboriginal Burial Ground was formally protected in 2020, and interpretation across the island now treats this history as central rather than incidental. The built fabric is layered. The Vlamingh Lookout crowns the island's high ground at 45 metres. Wadjemup Lighthouse, first lit in 1849 and rebuilt in 1896, remains the oldest stone lighthouse on the Western Australian coast. Oliver Hill Battery, completed in 1937, still holds its two 9.2-inch coastal guns and their tunnel network — a Second World War installation that never fired in anger. Salmon Bay, Little Salmon Bay and the Basin form a chain of protected snorkelling water along the southern shore. A guided Wadjemup bus tour threads these points together in a way cycling rarely does, which is why rottnest island bus tour cost tours consistently outsell self-guided options for first-time visitors and mixed-ability groups. Coach commentary covers the salt lakes — nine of them, hypersaline and pink in certain light — the osprey nests on the West End cliffs, and the reef systems that have claimed at least 13 recorded shipwrecks since 1842. The island is A-Class Reserve land. Nothing may be built, cleared or removed. What arrives on the 07:30 ferry is, in every meaningful sense, what has been there for millennia.