Heart-shaped, tiny and sandy, Green Island is the easiest of any of the Barrier Reef’s coral cays to reach, making it an accessible, if expensive, day-trip from Cairns. This, combined with the island’s size, means that it can be difficult to escape other visitors, but you only need to put on some fins, visit the underwater observatory or go for a cruise in a glass-bottomed boat to see plentiful coral, fish and turtles.

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