Port Douglas day dive trips are essential to include in your tropical vacation, offering a world-class experience of the Great Barrier Reef system and stunning marine life. With family cruises, reef tours and dive trips departing Port Douglas every day of the year, there’s something here for everyone. This fantastic opportunity to explore the world’s largest single structure made by living organisms, including sand and coral cays, pristine islands and of course the Outer Great Barrier Reefs, Opal Reef and Agincourt Reef