Kid & Family Event. Join leaders for a hike that will focus on bird species along the Horicon Marsh Education and Visitor Center trail system; a boardwalk reaching out to Indermuhle Island through the marsh and covering a variety of habitats. Walking on uneven trails and in damp foliage is a possibility. Meet at the Horicon Marsh Education and Visitor Center, off of Hwy. 28 between Mayville and Horicon.