The Fairy Park is a very imaginative use of otherwise very rocky and useless piece of land. The large boulders have been adapted to give the image of a fairy castle kingdom. We took our kids there when they were young and then they went again with the school and really enjoyed all the activities that are organised when they have a school group. Make sure you only go when the kids are young as it is the type of place where kids suddenly grow out of it. It also a long drive. Consider a visit to the You Yangs (it has koalas).