The map is an abstraction that serves the story. Being an abstraction, what you leave out is at least as important as what you leave in. People will read into your map things that aren't there anyhow, so put in what you think is helpful and don't let anyone tell you otherwise. Simple linework is sometimes more useful than pretty colors that most publishers won't pay to put into the book.
As the smart folks above advised you: never give up, never surrender. Fail with a pencil, fail with a pen, fail with Photoshop. Fail until you fail so badly that things turn out well enough to be usable.
Never drink before offering advice.
tree0.jpg