Cruise.com offers a Carnival Cruises 4-Night Mexico Cruise for Two with prices starting from $478, as provided by ShermansCruise. (Scroll to the bottom of the landing page and click the red "Book Now" button to the right of the May 1 sailing date.) That's the lowest price we could find for such a cruise in May by $20. This roundtrip cruise aboard the Carnival Inspiration departs on May 1 from Long Beach, CA, with stops in Catalina Island, CA, and Ensenada, Mexico. Additional fees may apply. Book this travel deal by March 31.