Like most of the segments making up the incredible Summit County Recreation Path system, this trail is 9 miles of paved, easy, mostly flat riding with great scenery.
Starting from the edge of the dam that creates Dillon Reservoir, cruise along Dillon Marina Park and wrap around the lake, using short bits of road a couple times. Once you leave the lake, you hug highway 6 for a short ways, which is a bit less pleasant, but once you pass Summit Cove, the path diverges from the highway and follows the Snake River.
This part is my favorite. There are no big mountain views, but the river is beautiful and there are many picnic tables along the way.
Keystone Resort is the logical end of the trail, but it does wiggle through town (occasional on short segments of road) and go a bit further up Montezuma Road if you have a need to complete the trail.