Vacations to Go offers a Carnival Cruise 4-Night Cozumel Cruise for Two with prices starting at $818. That's the lowest price we could find by $200, although we saw this cruise for $20 less two weeks ago. This roundtrip cruise aboard the Carnival Sensation departs from Miami, FL, on July 27 with stops in Cozumel, Mexico; and Key West, FL. Additional fees may apply. Book this travel deal by June 30.