Royal Caribbean's Oasis of the Seas cruise ship has a population of more than 8,600 when fully booked. The ship features 24 restaurants, two rock-climbing walls and three on-board doctors. The crew deals with everything from cleaning saltwater off the windows to dealing with 700 tons of new supplies, including 80,000 bottles of beer and 20 gallons of maraschino cherries, for each weeklong sailing.

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