I'll let someone else give you ideas for the Bahamas because its been a long time since I have been there. But, I'll suggest you go to the Port Chat section of this forum and look in the Caribbean ports section. You find more there than looking in the general Carnival cruise line section. Have a great cruise!
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