Belize is good and you should still be going there. Costa Maya- not so much. They have shut down Costa Maya for cruises. That may change by March, but I would not get hooked on the idea of going to Costa Maya. If you DO go there, you can count on it being a tender port. (Meaning the pier will not be repaired by then. Expect the cruise line to change ports.
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