William Mitchell State Park is a public recreation area covering 660 acres (270 ha) on the southwest side of Cadillac in northern lower Michigan.

[4] The park is home to Carl T. Johnson Hunting and Fishing Center which documents the history of hunting and fishing, offers seminars, workshops and audio-visual presentations, and includes an exhibit hall which displays local wildlife species.

[8] The park offers a campground with 221 sites, cabins, two boat launches, playground, beach, picnicking facilities, and fishing for perch, walleye, panfish, and bass.

The trail, mostly a woodchip path with a series of bridges and boardwalks, provides a study area supporting a variety of plants and wildlife.

Winter activities include snowmobiling, ice fishing, snowshoeing, and cross-country skiing.