If we build our boat like an actual boat or canoe shape then it would float longer than other boasts.
We also put toothpicks on the bottom of the boat so the sides wouldn’t fold inward.
We came in 2nd to last with 41 nickels.
The problem with our boat was that the toothpicks started to break through the tinfoil and they created holes.
Next time we would put marshmallows on the sides to help it float, and put the toothpicks in the bottom or not use them at all.