One possible starting point for the Track, which follows the Greenstone river and the Caples river in a loop. Takes approximately 4 days, with 3 serviced huts on the way. Free camping is possible in some areas, if you make sure to stay 50m off the track and 200m off the huts and not to offend private property (check with a DOC beforehand).
Very nice track, we hardly met any people in mid october. Various changing landscapes such as bush land, forrest and of course the rivers with beautiful views of mountains in the background.