Myuna Farm is certainly worth a visit. It's cheap and great for littlies. We always have fun when we go there. You get really up close to all the animals there. Whenever we've been they've given us a loaf of bread to feed to the animals. Picnic & bbq facilities & a kiosk with basic snacks. If you go on Sunday you could drive a little further and go to the Berwick Market.

Lillydale Lake is nice. It's at Lilydale. Lots of play equipment - mostly for bigger kids but some stuff for the little ones. A lake with ducks. On weekends there's an iceream van and a coffee van. A great track round the lake to walk on with the pram. Great facilities for picnics. It's always been free when we've gone there.