Cycling in Sydney Australia
A variation on the Cooks River theme for children that like planes is to park on Coward Street and then ride the path around the airport. Cross the canal into Tempe Park and continue to the Princes Hwy. Then either cross Princes Hwy and follow the Cooks Rivers path as long as you like, or head toward Brighton-Le-Sands. To do that, cross the river using the Princes Hwy bridge shared path into Cahill Park. Then Levey Street and the shared path along Marsh Street, using the underpass to cross Marsh Street and on to a nice ride around the foreshore on shared paths through Kyeemagh.
Narrabeen is meant to be brilliant but havent done it yet. Manly beach to Shelly Beach is fun during the week. Or you can cycle further up along the lovely quiet path that goes up along Burnt Creek Ridge Road and the Golf Course. Its not long but does go along a wooded creek for a ways. Could be just the right duration for the little one. Connects to Manly via Kenneth Road and so no need to get involved in traffic anywhere along its length.