Are you ONLY going to the Bahamas? I'm not familiar with Disney Cruises, for some reason I thought they made multiple ports of call. If it's only the Bahamas, she is right, you can use a drivers license and birth certificate if you are departing from Port Canaveral and returning, with the Bahamas as your only destination.
I'd still go for Alaska if someone were giving me $3,000 for a trip, but thats just me.

Especially now that I know it's a
Disney cruise to Alaska...that makes it that much better.
Looking at FB posting from some friends I have who are stationed up there though, I might second guess that decision since it was
-42 this morning!!!