When traveling on Marine Atlantic Ferries with small children, especially on the overnight ferry YOU MUST GET A CABIN! Do not assume that the general seating or the reserved seating will work for you. It won’t. A lot.
While the reserved seating is nice and dark, other people snore. A lot.
Learn from our terrible ferry crossing and get a cabin. Even when you’re in a cabin the walls are thin. Bring ear plugs.