Lots of great bushwalks and a Platypus viewing platform. You will have a good chance to see Platypus at dusk and dawn.
Finch Hatton Gorge
Walk from the carpark here for about 30 mins to Araluen Cascades. A beautiful waterfall and swimming hole. Another 30 mins on is The Wheel of Fire Cascades the second waterfall. Another great spot to jump into the water.