Iced coffee seems like the perfect drink for a European summer vacation — a heaping of ice to cool down from the warm sun and a dose of caffeine to keep up the energy for a day of exploring.

Coffee drinker stirs an iced coffee - Yana Iskayeva/Getty Images My family of 5 went on our first cruise. We had fun, but there are 4 things I wish we'd known before getting on the ship.