Explore the beauty of the Great Adirondack Forest as you traverse through the Adirondack Exterme treetop obstacle adventure course and zipline park and reach heights most will only dream of. Established in 2007, Adirondack Extreme Adventure Course was the first aerial adventure course to open in the United States. Others have tried to imitate, but none can duplicate the experience of trekking tree-to-tree on our aerial obstacles within the trees of the beautiful Adirondack Forest.