At Harvey's Return near Cape Borda, a cemetery speaks poignant volumes about the reality of isolation in the early days. From here you can drive to Ravine des Casoars (literally 'Ravine of the Cassowaries', referring to the now-extinct dwarf emus seen here by Baudin's expedition). The challenging Ravine des Casoars Hike (8km return, four hours) tracks through the ravine to the coast.
Ravine des Casoars
Kangaroo Island