Disney Cruise Line offers cruises of different length in the Bahamas on board the Disney Dream (the whole year round), Disney Wonder and Disney Magic (both outside of the Summer period).
From May to August 2012 the Disney Magic also made cruises to the Bahamas out of New York.
2 night Bahamian Cruise
Weekend getaway out of Miami without stops (Disney Magic, only 25-27 October 2013).
Miami -> Castaway Cay -> Miami (Disney Magic, only 20-22 October 2014)
3 night Bahamian Cruise
There are different options here. The first is on the Disney Dream the whole year round and also on the Disney Magic early 2014:
Day 1: Port Canaveral
Day 2: Nassau
Day 3: Castaway Cay
Day 4: Port Canaveral
The others are on the Disney Magic:
Day 1: Miami
Day 2: Nassau
Day 3: Castaway Cay
Day 4: Miami
Day 1: Miami 
Day 2: Nassau
Day 3: Key West
Day 4: Miami
Day 1: Port Canaveral 
Day 2: Sea
Day 3: Castaway Cay
Day 4: Port Canaveral
4 night Bahamian Cruise
This cruise has different itineraries on different ships.
Disney Dream/Magic
Day 1: Port Canaveral
Day 2: Nassau
Day 3: Castaway Cay
Day 4: Sea
Day 5: Port Canaveral
Disney Dream
Day 1: Port Canaveral
Day 2: Nassau
Day 3: Sea
Day 4: Castaway Cay
Day 5: Port Canaveral
Disney Dream
Day 1: Port Canaveral
Day 2: Sea
Day 3: Nassau
Day 4: Castaway Cay
Day 5: Port Canaveral
Disney Dream/Wonder
Day 1: Port Canaveral
Day 2: Nassau
Day 3: Castaway Cay
Day 4: Castaway Cay
Day 5: Port Canaveral
Disney Magic
Day 1: Miami
Day 2: Castaway Cay
Day 3: Sea
Day 4: Key West
Day 5: Miami
Disney Magic
Day 1: Port Canaveral
Day 2: Castaway Cay
Day 3: Nassau
Day 4: Sea
Day 5: Port Canaveral
Disney Magic
Day 1: Miami
Day 2: Sea
Day 3: Nassau
Day 4: Castaway Cay
Day 5: Miami
Disney Wonder
Day 1: Miami
Day 2: Key West
Day 3: Nassau
Day 4: Castaway Cay
Day 5: Miami
Disney Wonder
Day 1: Miami
Day 2: Castaway Cay
Day 3: Nassau
Day 4: Key West
Day 5: Miami
5 night Bahamian Cruise
This cruise has 4 different itineraries, on the Disney Wonder or Magic. Each they’re only once:
Disney Wonder (09/26/2014)
Day 1: Port Canaveral
Day 2: Key West
Day 3: Castaway Cay
Day 4: Castaway Cay
Day 5: Nassau
Day 6: Port Canaveral
Disney Wonder (10/01/2014)
Day 1: Port Canaveral
Day 2: Castaway Cay
Day 3: Sea
Day 4: Key West
Day 5: Castaway Cay
Day 6: Port Canaveral
Disney Magic (10/20/2013)
Day 1: Miami
Day 2: Castaway Cay
Day 3: Sea
Day 4: Nassau
Day 5: Castaway Cay
Day 6: Miami
Disney Magic (12/30/2014)
Day 1: Miami
Day 2: Castaway Cay
Day 3: Nassau
Day 4: Sea
Day 5: Key West
Day 6: Miami
7 night Bahamian Cruise (2013 – Disney Wonder)
Here your have two possibilities on the Disney Wonder:
Day 1: Galveston
Day 2: Sea
Day 3: Key West
Day 4: Castaway Cay
Day 5: Nassau
Day 6: Sea
Day 7: Sea
Day 8: Galveston
Day 1: Galveston
Day 2: Sea
Day 3: Key West
Day 4: Nassau
Day 5: Castaway Cay
Day 6: Sea
Day 7: Sea
Day 8: Galveston
8 night Bahamian Cruise (2013 – Disney Magic)
Day 1: Galveston
Day 2: Sea
Day 3: Sea
Day 4: Castaway Cay
Day 5: Port Canaveral – Walt Disneyworld
Day 6: Sea
Day 7: Key West
Day 8: Sea
Day 9: Galveston