Read previewAfter working on various cruise ships all over the world for nearly a decade, I know a lot about their inner workings, from the best onboard activities to the tastiest dining options. But with this knowledge, there are also things I'd now never do on ships. Sergii Kateryniuk/Getty ImagesExcursions booked through the ship come with the guarantee that if your tour runs late, the ship will wait for it to return. Excursions booked through the cruise are the safest option if you're worried about your ship leaving without you. d3sign/Getty ImagesCertain items like irons, steamers, and liquor are usually not permitted on cruise ships, but guests often pack them anyway.

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