This cache is placed on East Mercer Way, part of a popular bike route around Mercer Island. You are looking for a small lock n lock container.
The Mercer Island Loop circles the island via roads which run mainly through residential areas and forests. Elevation change is never too extreme or long, and on a sunny day there are some pretty good views of the lake along the route. The ride gets interesting on this side of the island, with the road constantly winding through ravines in an awesome forested landscape. There is a pull out near the cache for parking. Watch out for muggles and don't forget to rehide the cache well to keep it out of sight.