Carnival Cruise Lines is picking up the pace on its shorter cruise offerings from Miami with the addition of Carnival Imagination and Carnival Destiny in September 2008. Carnival Imagination, which will be the first ship to be completely remodeled under Carnival's $250 million "Evolutions of Fun" enhancement program, will sail year-round three- and four-day cruises beginning Sept. 22, calling on such ports as Nassau, Key West and Cozumel, while Carnival Destiny will offer four- and five-day sailings when it launches its program Sept. 27, visiting--in addition to Key West and Cozumel--ports such as Grand Turk and Grand Cayman. Vicki Freed, Carnival's senior vice president of sales and marketing, says shorter itineraries are in high demand among customers. Reservations will begin being accepted on August 24, 2007. Visit [www.carnival.com].