Michigan Trail Maps says that Grand Mere State Park:
…is a 985-acre unit in Berrien County that lacks the amenities found in most other state parks along Lake Michigan, including a campground and even direct access to its mile of Lake Michigan shoreline. It attracts only a fraction of the visitors that flock to parks such as Warren Dunes or Hoffmaster. Yet from a naturalist’s point of view Grand Mere is one of the most inquiring set of dunes in the state, an area so ecologically diverse that it 1976 it was designated a National Natural Landmark by the U.S. Congress.
The glaciers that scooped out the Great Lakes 10,000 years ago also carved out a number of smaller depressions along the western edge of the state, which evolved into interdunal lakes, ponds, and wetlands. At one time, this area contained a chain of five such lakes that were protected ecologically by a line of windblown sand dunes between them and Lake Michigan. Now there are only three, a result of aquatic succession. Today Grand Mere is a textbook example of the various stages of succession from aquatic communities to terrestrial. Beginning at North Lake, you can see how each lake is progressively disappearing, with open water first turning into marsh and then woodland swamps and closed bog forests, the fate of the former two lakes that lie south of the park.
Almost 4 miles of trails form a loop through open dunes and the wooded areas of the park, but the only designated trail is a half-mile Nature Trail. The paved, handicapped accessible trail extends from the picnic shelter around South Lake, passing 10 interpretive posts that correspond to back of the park map. The rest of the trails are neither posted nor maintained. The most distinguishable trail extends almost a mile from a small parking area off Wishart Road to the west end of the Nature Trail.
Mark took this photo a couple months ago & you can see more in his Spring gallery on Flickr.