17. Glenwood Dunes, Calumet Dunes. 23. Glenwood Dunes Equestrian Trail. 19. Great Marsh. 26. Marquette Bike Trail. 20. Mount Baldy Summit (Scheduled Tours Only) 22. Pinhook Bog (Scheduled Tours Only) 21. Heron Rookery. Hobart Prairie Grove. Horse and Bike Trails. Maps - Indiana Dunes National Park (U.S. National Park Service) 24. Porter Brickyard Bike Trail. 25. Calumet Bike Trail. 27. Oak Savannah Bike Trail. Hiking Trails. 11. Paul H. Douglas Trail (Miller Woods)