Carnival Cruise offers a Carnival Cruise 7-Night Eastern Caribbean Cruise for Two with prices starting at $618, as provided by Travelzoo. (It's the top offer on the page.) That's the least-expensive 7-night Caribbean cruise we've seen on Carnival in the last 12 months. It's also a current low for this cruise by $260. This roundtrip cruise departs from Miami, FL, on March 30 with stops in Nassau, Bahamas; St. Thomas, U.S. Virgin Islands; San Juan, Puerto Rico; and Grand Turk, Turks & Caicos. Some restrictions may apply; fees, government taxes, and fuel supplements are additional. Book this travel deal by March 31.