Guests who book with Costa through Feb. 23 will receive a free upgrade in room type on many of the line's ships. The offer is available on most 2007 and 2008 Caribbean sailings, which feature the inaugural Caribbean season of the Costa Fortuna cruise ship. It is also available on select 2007 Europe sailings, including the new Costa Serena liner. Guests who pay for an inside stateroom will receive an ocean view stateroom, while guests booking an ocean view room will receive a veranda stateroom. For more information, visit [www.costacruises.com].