There is still some romance attached to the idea of sea travel; cruising the world's oceans in luxury and comfort; sailing to far-flung destinations as the first explorers did hundreds of years ago. Some cities are seen at their best by an arrival by water, gradually revealing themselves as the ship sails ever closer--Malta, Sydney and San Francisco to name a few. The Peninsular & Oriental Steam Navigation Co. and, today P&O Cruises, have been taking...