How can i make a boat transport?

i need a script to move a boat smooth is that posible?

no animation please mine always dont work

(my english is bad and i am 13 :P)

Try this post http://answers.unity3d.com/questions/6841/how-can-i-fake-buoyancy-floating-with-a-configurable-joint-or-with-a-script Buoyancy is what made Archimedes run naked in the streets yelling "Eureka" :)