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Small ships are often the best, and sometimes the only, way to visit some parts of the world. The etthos is very different from larger vessels - It is about the destination and the goal is to get passengers off the ship as much as possible rather than keeping you on board so you can lose money in the casino.
Croatia, Alaska, Antarctica, Spitsberge, Norway's Fjords, The Greek Islands, The coast of Turkey and many other corners of the world are best visited on a small ship.