I do remember cruising the Paradise on Halloween a couple years ago and Yes a lot of people wore costumes and the ship was decorated for Halloween, too!
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Memories Past:
Carnival Paradise - Catalina/Ensenada - 1/11/2010, 1/12/2009, 10/31/2005, 11/01/2004
Carnival Splendor - Canada - 5/10/2009
RCCL Monarch of the Seas - San Diego/Catalina/Ensenada - 5/29/2006
Carnival Ecstasy - Catalina/Ensenada - 2/16/2004
Carnival Holiday - Eastern Caribbean - 1985
HAL Noordam - Mexican Riviera - 1980's
RCCL Song of America - Eastern Caribbean - 1980's