William G. Milliken State Park and Harbor

"A Green Oasis in Detroit If you are looking for a quick escape from the bustle of the city, head for William G. Milliken State Park and Harbor, a green oasis in downtown Detroit. The harbor features a 63-foot replica of the Tawas Point lighthouse and offers several covered picnic areas as well as shoreline fishing. Over the last decade, much of the area has been redeveloped as wetlands and there are displays explaining how the wetlands clean and return water to the Detroit River. The RiverWalk passes all the way through the park, as does a bike path that links the park to Atwater Street."