As Hurricane Dean threatened the Caribbean, cruise lines were keeping a close eye and altering ship itineraries as needed to avoid the storm. Carnival Cruise Lines changed itineraries for the Carnival Destiny and Carnival Miracle. The Destiny will remain at sea today, Aug. 17, instead of a scheduled call at Antigua, and on Aug. 18 will visit Tortola instead of a sea day. The Destiny is scheduled to return to San Juan as scheduled on Aug. 19. The Miracle is set to call at Grand Turk instead of San Juan on Aug. 18, Half Moon Cay instead of St. Thomas on Aug. 19, and Nassau instead of Tortola on Aug. 20. Royal Caribbean International said it is closely monitoring the path and progress of Hurricane Dean but had not altered any itineraries. The line said it would post an update on storm information at 1 p.m. Friday on its website.