MGN Online

Published: Sep 12, 2013 4:26 PM EDT

MIAMI- Carnival Cruise Lines is now offering a "Great Vacation Guarantee."

The Miami-based company is promising that passengers who aren't happy will get a 110 percent refund, a ride home and a $100 credit to use for a future trip.

Customers have 24 hours from the time they board to express their unhappiness. This offer is for select cruises through April 30, 2015