In the Midwest, you can find hiking trails that are open all year long. Ohio offers some of the finest. Scorching summer months give way to crisp falls. As winter unfolds, tree-lined rivers freeze into slabs etched by the footprints of thrill-seeking deer. Early spring is lovely. Once barren timber thickets explode with dense foliage and wildflowers, creating an eight-million-acre salad of black walnut, white ash, purple coneflowers, and other ingredients, the most unique being a fruit tree called the pawpaw .