- Cahokia Mounds State Historic Site
2200-acre tract preserving the remnants of the ancient Mississippian's central city, now situated between St. Louis, Missouri, and Collinsville, Illinois.
- Illinois Prairie Path
55-mile-long biking, hiking, jogging, equestrian, and nature trail in Cook, DuPage and Kane Counties.
- Shabbona's Lakeside Online
Shabbona Lake State Park is located in Northern Illinois.
- Volo Bog (1)
- Shawnee National Forest
Headquartered in Harrisburg, IL.
- Old Plank Road Trail
Includes maps, history, and sights along the paved recreation path in Cook and Will Counties, Illinois.
- ChiTown Cachers
Diverse group of people living in the Chicago metro area and united by a common interest in geocaching.
- Prairie State Canoeists
A nonprofit club that organizes canoe and kayak trips, strives to improve river access, and promotes general paddling activities.
- Snow Hunters of Northern Illinois
Snowmobile club serving the Chicago and Western suburban areas.
- Lake Renwick Heron Rookery Nature Preserve
Provides protected nesting sites for the local herons and egrets.
- Team April
Family geocaching team in the Chicago area. Meet Mac, the Geocaching WonderDog, and learn about their cache finds and hides.
- Illinois Association of Park Districts
Nonprofit service, research and education organization that represents park districts, forest preserves, conservation and recreation agencies.
- Illinois Chapter of Ted Nugent's Sportsmen of America (TNUSA)
Information about events, gun and hunting legislation, and more.