Wadjemup / Rottnest Island has the world's largest quokka population, most active early in the morning and late in the afternoon. Watch them from a distance; don't touch or feed them. Hire bikes from the ferry companies or Pedal & Flipper, or ride the Island Explorer bus with its 19 stops.

This hollowed-out reef is a 10-minute walk or short bike ride from the main settlement. When the wind blows from the south-east, south or south-west, the water is calm and protected for kids learning to snorkel. Showers, barbecues, drinking water and toilets are by the beach.

Fremantle Prison is WA's only World Heritage listed building, and the Gatehouse visitor centre and Convict Depot are free to enter. The Convict Prison Tour leaves on the hour from 10am and takes 1 hour 15 minutes, with plenty of stairs. A family pass was $73 in October 2026, and the True Crime Tour isn't recommended for under-10s.

Surf lifesavers patrol Cottesloe Beach on weekends and public holidays from October to April. Around the end of October, a swimming enclosure goes in off the groyne, reaching 170m along the beach and 140m out. Trains on the Fremantle line stop at Cottesloe station.

Kids 15 and under get into the WA Maritime Museum free, and the America's Cup yacht Australia II is inside. Guided tours of the submarine HMAS Ovens leave every half hour from 10am to 3.30pm. The museum opens 9.30am to 5pm daily, a walk from Fremantle Station.

The 2026-27 season opened on 26 September. Hours vary through the season and the park shuts in wet weather, so check both before driving to Bibra Lake. A "Which ride suits you?" guide helps match rides to younger kids.

The WA Shipwrecks Museum tells of Australia's oldest shipwrecks, WA's dangerous coast and the first European encounters. Entry is free, with a suggested $5 donation. It fills convict-built stores on Cliff Street and opens 9.30am to 5pm daily.

The underwater trail starts at the Omeo shipwreck, just 25m from shore, and runs 200m west along the breakwater. Most of it is 2.5 to 5m deep, which suits snorkellers. Use the stairs rather than climbing the rocks; Omeo Park has toilets, showers and a change table.

The Bibra Lake Regional Playground, Cockburn's largest, is about 540m from the lake. Kids can ride the double flying fox, cross tree-top rope walks and dig for a 25,000-year-old Diprotodon fossil. The gates are open 8.30am to 9pm, seven days a week, all year.

Aircraft fill two large hangars at the Aviation Heritage Museum, and a Young Aviators area has hands-on activities. It opens 10am to 4pm daily; allow one to two hours. A family ticket is $40, under-5s are free, and it may close on extreme-heat days.