We were surprised by the use of English in most places. We always try to learn a few key phrases and words (please and thanks and also hello/goodbye) but Hungarian was a challenge for us. We were able to navigate the city on our own and never felt uncomfortable.
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Leave your formal clothes at home. Pack light. We always seemed to dock in the perfect spot to allow easy access to the city/village we were in. Stop in at the bridge and watch the captain handle the ship. Also, if offered, take the engine room tour. Book the Captain's Table restaurant EARLY.