At just about an hour outside of Melbourne, Hanging Rock just outside Woodend/Mt Macedon makes a perfect stop to get some nature outside the city. Leisurely hiking trails and amazing views can be found if you make your way to the top of Hanging Rock, it's only about 15-20 min to get up to the summit. You can see views from 360 degrees at the top; all the surrounding farmland and forest.
I highly recommend making the scenic country drive out to Hanging Rock! It is an easy hike and well worth it for the unique view of the rock formations. Another Melbourne Day trip off the Australia bucket list!