The Port Campbell National Park area, which is home to the Twelve Apostles, Loch Ard George, and other amazing landforms, has many good walks. Most are along wooden boardwalks; some also include steep stairs down to the beach. The Visitor Centre at Port Campbell has all the details.
Inland from Port Campbell is the Camperdown-Timboon Rail Trail (also known as the Coast to Crater Rail Trail). It passes by lakes and streams and open volcanic plains. It is suitable for walkers and mountain bikers. The 36-km (22-mile) trail has good signage. Ask at the tourist offices for details.