Canal Builder is the unique builder's world that contains an already-existing canal and boatride, so all you have to add are the buildings and details, manniquins and NPCs and such that you want in your boatride. The hardest part, the mechanics of the voyage, is done for you, all the math is in, the boatride is guaranteed to work, unless you meddle with it, of course, without saving the previous version on another drive, but all that's for later, when you seek help from a builder's class, which we have almost every day, so there's no excuse.