I noticed we have cars and the metro train but what if we had boats! Boats to help up make our town a little bit more interesting, the boat can bring townspeople to one part and another throw the waters, which can open the idea to different types of boats to transfer supplies and people, but what if you add oil spots to power the boats player have to get oil rigs to supply the boats, with that we can have docs which will kinda work like the fishing, player can place a area where boats can doc at for people and supply runs.
