Copper Harbor is just short of the northeastern tip of the Keweenaw Peninsula and the end of US-41 from Miami. Take either US-41 or M-26 north from Houghton-Hancock; the two routes share roadway part of the way, with the state road taking a couple of detours. When they split at the crossroads of Phoenix about 8 miles north of Ahmeek, you have your choice of routes: M-26 meanders along the Superior shoreline, US-41 "tunnels" through a lovely canopy of trees, and Brockway Mountain Drive accessible at Eagle Harbor from M-26 follows a ridgeline and offers some great views but is not plowed in winter and has some very steep grades.
The city is on a harbor of course, but the only commercial service is to and from Isle Royale National Park.