Vacations to Go offers a Carnival Cruise 7-Night Caribbean Cruise for Two bundled with a cabin upgrade with prices starting at $738. (If prompted, sign up for the free newsletter to see this deal.) That's the second-lowest price we've seen for any 7-night cruise from Carnival. It's also a current low for this cruise by $580. This roundtrip cruise departs from Miami, FL, on February 2 with stops in Cozumel, Mexico; Belize City, Belize; Roatan Islands, Honduras; and Grand Cayman, Cayman Islands. Some restrictions may apply; fees, government taxes, and fuel supplements are additional. This travel deal ends February 1.