I tried adding a humanoid to the boat it self and also added a humanoid to the boat seat. Do I add it to both or only one. If only one ,which one?. Also i need to make sure the boat breaks when all health is gone and the player will die once the boat breaks. How do I do that?
In this situation I would use a number value that represents health, no need for humanoid. To make sure all the parts break just add a script that circles through the boat and deletes any welds. For the player to die then just use the seats preset value for the humanoid weld and make it so once it reaches 0 so does the person.