U.P. Trail Riders Association
http://www.theoutspokensportsman.net/uptrailriders.htm
Michigan Horseman for Public Land Use
http://www.theoutspokensportsman.net/mihplu.htm
U.P. Sportsmans Alliance
Gun Owners of America
Michigan Gun Owners
Great Lakes Forum
http://www.greatlakesforum.com/component/option,com_frontpage/Itemid,1/
Note that this is a new page. There will be more organizations added soon.