Here are a few Cruise lines that offer mini cruises, Also includes a little about the cruises they offer.
COSTA CRUISES - Best for short four and five-night cruises in the Mediterranean in Spring and Autumn. Some cruises also include an overnight stay in Venice.
DISNEY CRUISE LINE - Best for three or four day Bahamian cruises onboard the Disney Wonder. Both itineraries include a day in the Port of Nassau, and Disney's own private island paradise, Castaway Cay.
FRED OLSEN CRUISE LINES - Best for a limited number of short cruises each year on Black Watch, Braemar and Black Prince. From 3 to 8 nights. From Dover, Southampton, Leith or Greenock and visit ports in France, Spain, Belgium, Channel Islands or Norway.
NORWEIGIAN COASTAL VOYAGE - Short cruises designed to provide a flavour of the full coastal voyage experience. Ideal for those who are short of time but still want to sample the beauty of the magnificent Norwegian coastline.
ORIENT LINES - Five night cruises to Rome & the Rivieras of France and Italy plus two-night hotel stay in Rome in the Crown Odyssey. Sailing around Dover and Lisbon area.
P&O CRUISES - Best for four night short cruises. Arcadia, Aurora and Victoria have four night cruises visiting the Netherlands and the Channel Islands.
ROYAL CARIBBEAN - Cruises out of Southampton, Splendour of the Seas will sail a number of European itineraries. Short cruises on: four night Belgium and Netherlands cruise, and three night France and Channel Islands cruise.