Hop aboard the high-speed catamaran, ‘Poseidon,’ and you’ll have more time to spend scuba diving and snorkeling the outer Great Barrier Reef. This dive cruise from Port Douglas provides beginning and certified divers access to three different dive sites. Select among more than 35 pristine locations along the Agincourt Ribbon Reef. Bonus: you might swim in the natural habitat of seasonal dwarf minke whales. Lunch is provided.