I assume you mean the Valor. They seem to always have this cruise priced very inexpensively. To be honest I do not know why. It's a great itinerary. We enjoy each port (Belize is limited in that you really need to do an excursion because the port area and city are not that impressive unless you only want to shop). IF you enjoy beaches and snorkeling/scuba diving ... this is YOUR cruise. Maybe the other itineraries out of Miami are more popular and since there are so many ships leaving Miami they have to price this one low to fill it up, but I really don't understand why. We had a great time and the Valor is a great ship with wonderful crew...
One possibility is the number of sea days.. on the trip. Some people want to be in port more than at sea. For me... I would rather it the other way around.
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, Celebrity Silhouette 2013