34 hits to date and no answers, no prizes for guessing why. You need to be more specific with your question like when you want to cruise, preferred itinerary, and it would help to spell the ships name correctly.These ships operate from the American seaboard and such short cruises would only be really viable if you want them as an add-on to a USA holiday. Other than that google the ships name and see what you come up with.
Why don't you look at internet travel agent sites or a Carnival cruise brochure instead of asking silly questions on this site?
You'll have 2 different route to choose from for 4 days with Carnival Fascination
1. From Jacksonville to Freepost (port Lucaya) Bahamas then Nassau back to Jacksonville
2. Miami to Key West, Cozumel Mexico then back to Miam.
Use the internet to search, though i do not believe there is a ship called fasination which might be why you are asking the question.
To answer this question anyone would have to consult their brochure. So why not do that youself.