1. Great Barrier Reef is the world’s largest coral reef system, located in the Coral Sea off the coast of Queensland, Australia. It stretches over 2,300 kilometers and is home to a vast array of marine life, including over 1,500 species of fish and 600 species of coral. Visitors can go snorkeling, scuba diving, or take a glass-bottom boat tour to see the diverse ecosystem firsthand. Cairns is a popular gateway to the Great Barrier Reef and Tropical North Queensland, offering numerous activities such as zip lining, hiking, and wildlife spotting. The Tropical North is known for its lush rainforests, cascading waterfalls, and stunning beaches.

2. The Great Barrier Reef is open 24 hours a day, but some tour operators have specific operating times. Phone numbers for tour operators can be found on the official Great Barrier Reef website (https://www.greatbarrierreef.org/). The Cairns Visitor Centre can also provide information on tour operators and their operating hours. The center is open daily from 9am to 5pm and can be reached at +61 7 4081 0700.

3. Ticket information for the Great Barrier Reef varies depending on the tour operator and activity. Prices can range from AU$50 for a half-day snorkeling trip to AU$400 for a full-day scuba diving excursion. The Cairns Visitor Centre can provide information on tour operators and ticket prices. Transportation to the reef can be arranged through tour operators or visitors can book a rental car or take public transportation from Cairns to the Port Douglas marina.