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On Pat's first cruise and Elise's second, they head out on a Desert Safari on Moreton Island. At Lightening Ridge, they learn how the area's unique glass pebbles form and then they hit the sand for dune boarding, an experience Pat nicely sums up with "I don't think I've been that fast on my stomach before".
More info: http://www.pocruises.com.au/findacruise/shoretours/Pages/ShoreTour.aspx?ShoreTour=TMI-055