Carnival Cruise Lines’ Holiday cruises off Cozumel, Mexico. Carnival operates the only year-round cruise program from Mobile, Ala., — four- and five-day voyages to Mexico aboard the 1,452-passenger Holiday. On this route, four-day cruises depart Thursdays and visit Cozumel while five-day voyages depart Mondays and Saturdays to Cozumel and Calica/Playa del Carmen or Costa Maya. (Photo by Andy Newman/Carnival Cruise Lines)