I'm not sure of the name of the ship, but when I was browsing Carnival web site I did see that they have cabins for 5.
Century Dec 2003 Western Caribbean
Century Nov 2004 Eastern Caribbean
Monarch of the Seas Jan. 2005 Baja Calif.
NCL Dream Nov. 2005 Western Caribbean
Monarch of the Seas Mar 2006 Baja Calif.
NCL Star Oct. 2006 Mexican Riviera
NCL Pearl Nov. 2007 Southern Caribbean
Mariner of the Seas May 2009 Pacific Coastal
Mariner of the Seas June 2009 Mexican Riviera
RCI Radiance of the Seas