Moraine Hills State Park near McHenry features glacial moraine terrain along the Fox River, with hills, marshes and prairie remnants left behind by ancient ice. Lake Defiance sits at the heart of the park and adds a scenic focal point. Trails circle the lake and wind through wetlands and woodlands, making it a great place for walking, biking and birdwatching. The park's varied habitats support many species, and its location makes it an easy escape for residents of the northwest suburbs. There is no vehicle entry fee. It is a good choice for a quick nature outing near Chicago.