Or how about the entire country that you signed up with. Google maps would have and you download from the GT website. Then you could free roam, or pick a city and drive around a pre-made course.
I suggest you use Google street view and follow the route, they really did pick a nice location for the track, and I think it would be a great addition to the game. I'm going there and I would be happy as hell if I saw some people there who looked like they were modeling the track.