The Swan River is full of shipwrecks, at last count more than 30. This week is the Mayfield and City of Perth wrecks to snorkel, and Blackwall Reach to dive.

Avoiding the crowds by diving the wrecks of Vergulde Draeck and Camilla.

Sea creatures are everywhere, at every spot and in all conditions. If you're starting out, Mettam's Pool is a great snorkel, and Ammo Jetty is where you can find the better-camouflaged creatures such as octopuses and sea horses.

Shark Cave off Rottnest Island, and the Australian sea lions of Carnac Island.

Snorkelling the Omeo Shipwreck on the Coogee Maritime Trail, and diving the North Mole wreck.