Robin Lake is a beautiful destination just over Geneva pass is a great basecamp for exploring Sheepherder Basin.
Starting at Coffeen Park, head south on the Solitude Trail. This trail will wind through the woods for several miles, passing Lake Geneva, and then Solitude Lake. After a glimpse of Solitude (it's a bit off the trail to the west), you'll start the climb up to Geneva Pass. After Geneva Lake, the elevation comes quickly, and in a relatively short distance. Push through it and you'll be at the pass in no time.
This is a beautiful area, and the pass is a dramatic notch in the surrounding mountains. Keep an eye out for old mining equipment. Once you crest the pass, it's a short walk to a view of Robin Lake, just on the other side.
There is plentiful camping around the lake, in the rocky outcroppings nearby, or at a few of the unnamed lakes just a few minutes further down the trail. It's pretty hard to go wrong. We chose to find some flat ground in a group of raised rock outcroppings because it provided us a fantastic view of Black Tusk peeking over the ridgelines.
Robin Lake is a great basecamp if you're looking to explore some of the other beautiful lakes in the nearby.