You can hike over 9.5 miles of maintained trails at the Merrimac Preserve. Choose from one of 5 designated loop trails, a segment of the Ice Age National Scenic Trail, or your own combination. The trails are marked occasionally on the ground with small colored arrows according to the trail that you are following. Note that you may encounter additional mowed paths that are not part of the trail system. For example, firebreaks or maintenance access routes.