Hello Leomerya12, thank you for posting.
A few places/values I would check are:
Check if ‘Simulate Physics’ is checked on the boat mesh. If it is not checked, please do so.
Then check the Mass value. If its too heavy, it may not float as easily.
I was unable to see if your boat had a buoyancy component. Adding a buoyancy component and tinkering with the Pontoons value (adding members of the array/setting relative location) would also render results.
I hope this information assists you.