Dave... I don't have first hand knowledge (yet...) but does the Mariner have a kiddie pool (one that isn't deep) so they can stand up all the time?
Other thought was to bring blow up type water wings. That way you can deflate them to put them in the luggage and still have somethin gfor them to wear.
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Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007
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