There are no hard and fast rules about what not to bring on a boat, but the captain may request that guests leave the following behind:
Shoes with soles that would mark up the deck
Glass containers, especially if a lot of people will be going barefoot
Cigarettes – if there are smokers on board, there may be a designated area. Smoking in certain areas of a boat can be a fire hazard.
Plastic bags or other items that can be swept away easily – keep those waterways clean!
There are also some interesting superstitions about things you shouldn’t bring on a boat because they are bad omens. Boaters say bananas are bad luck! This probably dates from the time when bananas had to be transported quickly before they spoiled, meaning fishermen didn’t have enough time to catch fish properly.