Among the most secluded as well as the most beautiful falls in Michigan, Rock River Falls is nestled deep in the woods of the Hiawatha National Forest not far from Munising. Getting to these falls is no easy feat, as it requires several miles of driving on poorly marked/unmarked forest roads, then hiking between 1 and 1.5 miles on an at times poorly defined trail, all the while battling mosquitos or whatever seasonal bugs there may be.
Getting there: From where M-94 makes a 90 degree bend in Chatham, take Rock River Rd north for four miles. Turn onto Forest Rd 2276, a somewhat well maintained road, after 3.7 miles turn onto Forest Rd 2293, going .6 miles to a small parking area. There is no sign for the falls, and seasonally these roads can get pretty bad - either follow the directions in the Penrose book exactly or have a current National Forest map on hand to be sure. The hiking trail starts out wide like an old road but goes to crap after that - at times quite muddy and swampy.