I FINNALY GOT THE BOAT FLOATING RIGHT!!!!!!!!! So the problem was that the center of mass wasn't set correctly.
At first our boat would just tumble around because it was tiny
Then, we resized the boat to be bigger to not tumble as much. but it would flip and fly up in the air. It was a mess
After that I figured out that the center of mass wasn't right so I manage to find the center of mass parameters in the editor and now it does this:
I also got water displacement to work as well. Super simple, its just a option in the water material that you just click on.