Good idea, the south winds will push you the whole way. A quick glance at the map and you will see county roads between 281 and 35 that will go north and the route is hard to miss. You will need to be on 281 a couple miles south of Marble falls, but other than that nice quiet roads the whole way. I have never done it with GPS so cant tell you names of the roads, but I can find my way there without a map every few years.