In this Dec. 13, 2011 photo provided by Carnival Cruise Lines, guests 

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)
Associated Press
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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