We recently walked the Baldwin’s Bluff trail at Serpentine National Park, south of Perth. It’s only 6km there and back, but moderately hard going, with steepish up and down grades covered in small loose rocks.
There are impressive views from the top (above), with Serpentine Falls in the distance. We had a picnic lunch nearby, where there was this balancing walker’s cairn. The tiny rock on top is ours!