Join二十一 upcoming events being held in Cairns. Cairns is a vibrant, tropical city in Far North Queensland, Australia, known as the gateway to the breathtaking Great Barrier Reef, offering a wide range of adventurous activities from snorkeling, scuba diving, and sailing, to lush world heritage-listed rainforests, wildlife experiences, and cultural encounters, making it an ideal destination for nature lovers and thrill-seekers alike.