Wadjemup / Rottnest Island sits 19 kilometres off Fremantle, and on a clear spring day it is the single best thing you can do with 12 hours in Western Australia. It's also easy to do badly. Here's the order of operations.

Take the early ferry

Boats run from Fremantle (about 30 minutes), Hillarys and the city (longer, down the river). Book the first sailing you can stomach: you gain the island before the day-tripper wave, and the wind is usually gentlest in the morning — which matters when you're on a bike.

Ride against the clock, not the wind

Grab your hire bike and head out early to the far end — Wadjemup Lighthouse, or the full 22-kilometre loop to West End if your legs are honest. Do the distance first and let the afternoon be short hops between swims. Check the wind: whichever way it's blowing, plan to finish with it at your back.

Swim the small bays

The Basin gets the crowds because it's five minutes from the jetty, and it is genuinely lovely — but Little Parakeet Bay, Little Salmon Bay and the snorkel trail at Parker Point are where the island shows off. Spring water is brisk; by late morning you'll be glad of it.

The quokka rules

You will not need to find a quokka; a quokka will find you, usually outside the bakery. Phones low, no touching, no food — feeding them makes them sick, and the rangers issue real fines for it. Sit still, hold your camera at ground level, and the famous grin happens all by itself.

Last boat back is early evening most of the year. Miss the 4pm scramble by being at the jetty with a bakery haul at half past three, salty and smug.

Photo: Christophe95 via Wikimedia Commons (CC BY-SA 4.0).