Hi Marla....let's see if we can get you some info...
First....the 3 & 4 day cruises sail on the Disney Wonder. They go to Nassau in the Bahamas and to
Castaway Cay (Disney's private island). some of the 4 day cruises also include a stop in Freeport in the Bahamas.
You can book a week long package with 3 or 4 days at a WDW hotel and 3 or 4 days on the ship. Or, many people find it less expensive to book the two separately....book your hotel under one reservation and your cruise under a seperate reservation. Check out this site for discount codes to use when you call WDW for room rates.
http://www.mousesavers.com/disneyresorts.html#codes
There are many modes of transportation to the port from the WDW area...you can take a
DCL bus (transfer) which is included if you purchase your airfare thru DCL or you can buy the transfers separately.
You can also rent a car one way from WDW or MCO to the Port. Check out this link for great rental car information. (Also check the mousesavers site for rental car codes that may help you get a discounted rate on a rental. On the return you would rent a car in the port area and drop off back at MCO.
http://www.dcltribute.com/carhire/
http://www.dcltribute.com/directions/
Also, check out the whole site...it is a wealth of information.
You could also hire a car service. There are many options available in the area for car service/limo service.
MJ