The rivers are heavily fished and the fish feel the pressure. They have been caught and released a fair amount so that they become very picky. I would have my flies and nymphs pass directly over the fish or right next to them. Since my presentation was not perfect, they would at most go take a look and then go back to what they were doing.
But fishing isn't always just about catching fish. The scenery is spectacular.
I hiked from St. Arnaud along the lake side track. It is part of the five day tramp called the Travers-Sabine. It generally goes up the Travers Valley, up over Travers Pass, and then down the Sabine Valley. It was a three hour tramp to the first Department of Conservation hut, Lakehead Hut, in the Travers Valley. It is possible to take a water taxi up Lake Rotoiti to Coldwater Hut instead of walking for three hours. But if you take the water taxi you miss a peaceful walk through tranquil beech forests and the 40 meter tall Whiskey Falls.