Champlain Area Trails CATS (http://www.champlainareat...) is a network for hiking, walking, skiing, snowshoeing, birding, tracking, and picnicking in and around the Champlain Valley in New York Stateâs Adirondack Park. CATS trails encompass a rich tapestry of preserved wildlife habitats, pastoral farmland, historic villages, scenic woodlands, and a diverse aquatic system of streams, rivers, wetlands, ponds including the Boquet River and Lake Champlain.