From Lake City, proceed south on HWY 149 and take the turnoff to the right for Lake San Cristobal. Continue south around the lake and follow CR3 (BLM 3306) past the Williams Creek and Mill Creek campgrounds to the intersection at Sherman. (On Trails Illustrated, this is CR30) Road to here is drivable for standard passenger cars. Take the right fork and begin a steeper ascent into the upper valley. Higher clearance vehicles now advisable. It's a little over 3 miles to the Silver Creek/Grizzly Gulch trail heads used for accessing Sunshine, Redcloud and Handies. Continue just about one more mile to the trailhead for Cooper Creek. There is some parking on the west side just after crossing the creek or continue a little further to these coordinates (N 37° 56' 37.57" W 107° 28' 18.36") for another parking spot and the beginning of an old roadbed that leads north, then east to gain a bench above Cooper Creek. Drop one vehicle here, then continue driving on to the summit of Cinnamon Pass. After the turnoff for American Basin, the road begins to climb more steeply and becomes rougher. Park just on the west side of the pass.
There are designated, forest service campgrounds at Williams Creek and Mill Creek CG. There's also some primitive sites around Sherman. Once above Sherman, additional primitive sites may be found at the TH for Sunshine, Redcloud and Handies and again near the TH for Cooper Creek. You may even be able to find some other primitive sites or just road pull-outs further up the road past Cooper Creek and up into American Basin, but be aware of some private property issues.