the taxis get expensive so a bus/ferry is great. if i remember correctly it may be cheaper to buy a month or year pass than a 4 day pass, but look into it just to be safe.
Home Lines Doric 78, Oceanic, Homeric 85,Celebrity Horizon, Zenith,NCl Pride of America 05 (Honeymoon), Spirit 09-30-06,NCL Gem 12-29-07,NCL Spirit 5-17-08
NCL Dawn 7-27-08,NCL Sky 7-3-09
NCL Dawn Sept 20,2009
Pride Of America