Spend the day on Michaelmas Cay, a small sand island on the outer Great Barrier Reef. You'll cruise from Cairns aboard a luxury catamaran, see the reef's brilliant coral and marine life from a semi-submersible submarine, try scuba diving or go on a snorkeling tour. Lunch at the cay is a superb hot and cold buffet, including seafood.
Viator
The photo is courtesy of Viator.com