If location is the only factor, Mobile is your best bet. But you only have one choice, the Carnival Holiday, a 3 star ship offering 3 & 4 day cruises. Depending on where you are in Louisiana, New Orleans affords you the most choices of ships, in winter with Carnival, RCCL, NCL, and Delta Queen based here. Crystal stops here on occasion, and even P&O Lines, the Adonia in particular, was in port here for three days before continuing on to Cozumel, this being her last stop in the states. She is leaving P&O, a Carnival company, later this year.