Tread Lightly!, Inc. is a national nonprofit organization with a mission to proactively protect recreation access and opportunities in the outdoors through education and stewardship initiatives. Tread Lightly! provides outdoor ethics for all types of outdoor recreation-- everything from hiking to hunting to camping, with a special focus on motorized and mechanized recreation-- like four wheeling, motorcycling, snowmobiling, and boating.
MTGA is a non-profit organization that shall foster and facilitate the creation of an interconnected statewide system of trails and greenways for recreation, health, transportation, economic development and environmental/cultural preservation purposes.
Adopt-a-Forest mutual goals are to enhance enjoyment of public forest land by eliminating illegal dumping and to increase awareness of recycling opportunities for waste materials found.
The Adopt-a-Forest program goals are:
* Prevention through education
* Law enforcement
* Improved legal recycling and disposal options.
The program encourages volunteers--the program’s backbone--to clean up existing trash and to function as an "army" of educators.
The Huron-Clinton Metroparks system has a very open policy regarding Geocaching. They sponsor numerous events throughout the year around Geocaching and have an easy to follow and free permitting process to place caches within their parks system.
Currently, 13 Metroparks covering almost 24,000 acres, serve about nine million visitors annually. The Metroparks are located along the Huron and Clinton rivers, providing a greenbelt around the Detroit metropolitan area.
And now they list Geocaching as an official use of the park system. See the links below: