Take a leisurely nature walk and snorkeling tour to learn about Australia's natural environment and native marine life. This tour is designed for visitors who want to gain a deeper understanding of Australia's underwater and land-based environments and animals. Beginner snorkelers are welcome, but you must be able to swim 500 feet (150 meters) unassisted, float, and tread in water without assistance. A swim test is conducted at the start of the tour.