On day three, explore the fascinating underground world of Margaret River's limestone caves. Start with a visit to Lake Cave, known for its stunning crystal formations and serene lake. Take a guided tour to learn about the cave's geological history. Afterward, head to Mammoth Cave, where you can explore the ancient fossil remains and learn about the megafauna that once roamed the region. In the afternoon, immerse yourself in nature by visiting the Boranup Forest, known for its towering karri trees. Take a scenic walk or have a picnic amidst the tranquil surroundings.