Greenway Trust Priority Area: Upper Yakima BasinMap Categories: Campgrounds, Parks and Open Spaces, Picnic or Day Use Areas, Trails Think of an outdoor recreation activity, and Lake Easton State Park probably accommodates it in a spectacular lake and forest setting on the eastern foothills of the Cascade Mountains. Enjoy hiking, bird watching, picnicking, swimming, camping, biking, kayaking, and in the winter months – cross-country skiing, snowshoeing, and snowmobiling.