Well, you can make a boat character set from Paint or Photoshop, or whatever. Or, you coul get it from somewhere else. You would also need a character set of a person on the boat. Then, it would need eventing. This is RMXP you're talking about, right? Anyways, if it is, then you make it so when you press action key, then you can teleport your guy onto the water and make him able to go over water (somehow). Then you change the boat's graphic to [none] and the hero's graphic to the hero on the boat. Make sense? Probably not ><