Beautiful Rottnest Island, a low, sandy isle just off the coast of Perth, is a dream to visit by bike. Cars aren't allowed on the island roads, meaning you can cruise along in peace and quiet, stopping off at secluded beaches to swim, snorkel, and sunbathe at your leisure.

Step aboard a high-speed, ocean-going ferry to skim over the waves to Rottnest Island. Watch for swooping shorebirds and fur seals on the rugged coast as you approach the island, and then hop off and pick up your bike right on the jetty. Strap on your helmet and get to pedaling—the whole island is yours to explore, and at just 7 miles (11 km) long, you can bike from one end to the other at your own pace.

Ride from beach to beach, lock up your bike and trek along boardwalks or coastal trails, and stop whenever you'd like to swim, lounge, or picnic in the beautiful island surroundings. Watch for pods of dolphins and humpback whales from lookout points along the shore, and keep your eyes peeled for the island's most famous residents—adorable quokka kangaroos.

You can splash into the balmy, aquamarine waters to snorkel among schools of tropical fish and bright coral, ride up to the historic lighthouse at the West End, and invent your itinerary as you pedal from point to point. It's the perfect active outing for soaking up the sun, taking in the scenery, and getting a little exercise, too, during your day on Rottnest Island.