Snorkel & Dive Agincourt Ribbon Reefs Poseidon is a boat tour that takes you to the nature of the Great Barrier Reef. During our excursion, you will have the opportunity to do scuba diving in the great barrier reef in 3 different places or do snorkeling in the great barrier reef. On the boat, the staff of Snorkel & Dive Agincourt Ribbon Reefs Poseidon will be at your disposal for any need.