![Great Barrier Reef Great Barrier Reef](https://media.timeout.com/images/105263107/750/562/image.jpg)
1. Great Barrier Reef
What is it? The world’s largest coral reef, comprising more than 2,900 reefs and 900 islands.
Why go? This one is a no-brainer. Whether you’re a hardcore scuba diver, novice snorkeller or want to see the Great Barrier Reef without getting your hair wet, Cairns’ many tour operators have you covered. Take a boat trip to Green Island for island-based reef exploration or join a cruise for diving or glass-bottom boat tours.