"In this Dec. 13, 2011 photo provided by Carnival Cruise Lines, guests aboard the Carnival Liberty relax in an adults-only areas. Multi-generational groups are a growing segment of cruise passengers. To accommodate the diverse needs of old and young passengers, ships are expanding areas for youth activities while at the same time creating more adult-only pools and quiet areas where adult passengers can nap, sun, or read a book. Carnival ships call these areas ""Serenity Spaces.""  (AP Photo/Carnival Cruise Lines, Andy Newman)"
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