The Ausable River, which drains more than 500 square miles of New York’s Adirondack Mountains, squeezes through a flume below hiking paths that form a mountainside web. We went for the view and climbed to Flume Knob, about 1,300 feet above the river. After some serious rock scrambling, Sue celebrated as black flies joined us at the top. The Ausable River area, just a few miles from Lake Placid, is known as one of the country’s finest trout-fishing places. It empties into Lake Champlain at the Vermont border.