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Naturally, there are some amazing coral reefs for snorkeling and diving and pristine beaches (my favorite is Whitehaven Beach). Upon arrival, you’ll instantly see why this is one of the best tropical islands in the world — and why over half a million people visit a year. One of the most popular way to see the islands is via a multi-day sailing tour (which is what I did when I visited). It was an amazing experience — especially diving! Prices start around 450 AUD for multi-day sailing tours.
Since airline reservation requests are often made by city-pair (such as "show me flights from Chicago to Düsseldorf"), an airline that can codeshare with another airline for a variety of routes might be able to be listed as indeed offering a Chicago–Düsseldorf flight. The passenger is advised however, that airline no. 1 operates the flight from say Chicago to Amsterdam, and airline no. 2 operates the continuing flight (on a different airplane, sometimes from another terminal) to Düsseldorf. Thus the primary rationale for code sharing is to expand one's service offerings in city-pair terms to increase sales.