Kohler-Andrae State Park Sheboygan. Join master naturalist Karen Merlau and discover the many wildflowers growing along the Black River Trail. As the seasons change, so does the variety of wildflowers. Wear comfortable shoes and dress for the weather. Bring insect repellant, sunscreen and field guides if available. The hike will last at least an hour. Children must be accompanied by an adult. Meet at Black River Trail parking lot. All vehicles will need a state park admission sticker.