For a limited time on select 2015 and 2016 Carnival Cruise sailings you may receive a 2 category upgrade and up to $50 FREE onboard credit per stateroom based on double occupancy. Singles may receive up to a $25 onboard credit. Not all fares displayed online are eligible for this offer. Please call for more details. Hurry - offer ends 11:59 PM EDT on May 25th!