There are also some interesting points of history, like the old quarry and the ruins of the original Newman's Nursery. The Nursery site, especially, is a fascinating look at a piece of South Australia's hidden history. There are also some places where the views across Adelaide are stunning.
While walking, there are plenty of natural aspects to look at as well. The plant life is stunning, ranging from interesting fungi to out of place plants left after the nursery stopped functioning. Also walking through the park reminds you of just how well Australian flora recovers after a bushfire.
Joggers abound, and cross-country runners test their mettle. However, despite signs at the entrances, more than half the dog-owners we encountered decided that leashes were optional. One negative on an otherwise great day.
You can stay for an hour or spend the whole day, and you'll find plenty to do no matter what.
Re the plant that 'apparently' survived a bush fire. This is what they look like. No fire. In Queensland I was told they are called 'Black Boys' I have no idea why. Don't know their name down here. Quite rare.