Throw your children in the surf and let them get used to it. They have to learn all about rips and tides and swimming between the flags and all that sort of stuff. I know that sounds ridiculous but it's true.
We live our lives by the water and if you don't know how to swim in Australia, it's like not knowing how to cross a road. It's an incredible survival thing that you really must learn when you're a child.
I guess on a base level that's one of the first parental instincts that you have with children in Australia is learn to swim. Not only learn to swim but learn to swim strong.