The Brimbank Library on Station Road is fantastic and has activities for younger and older children. My children have been attending since months old and love it. The library staff are great. There is a great new playground at Isabella Williams Reserve in Deer Park lots of slides and cool equipment also has picnic tables and shelter and toilet facilities. There are a number of scheduled playgroups at Sassella park ( I haven't made use of these as I work part-time). The walking track along the Korroit Creek is great for riding bikes and scooters with kids and has two playgrounds you can stop at for a rest along the way.