Calgardup Cave is one of the easier cave visits in Leeuwin-Naturaliste National Park, with a self-guided route through roughly 300 metres of limestone chambers. It is less polished than some of the bigger show caves, but that is part of the appeal.
The cave sits south of Margaret River near the Caves Road attractions, close enough to combine with Mammoth Cave, Lake Cave, or a drive through Boranup Forest. Streams run through parts of the cave system, so wear shoes that can handle damp ground.