If ever you're in Te Anau in need of an easy spin, the Whitestone River Track may be just what you're looking for. It's part good back country road, part grassy 4wd track with some ruts and part gravel 4wd track. It goes down alongside Whitestone River for 10km. When you reach the end you can come back the same way or take the parallel roads. When you get back to the bridge you'll find the track going upriver about 400m along the road towards Te Anau. It follows the river for a few kilometers when you can turn back to the bridge for a ride of about 25km all up.