Heavy use makes this trail relatively clear and perfect for running.
From the parking lot next to Sylvan Lake aptly named the Sylvan Lake Day Use Area, look for Trail #9. It is the most traveled trail in the area, so it should be easy to spot. It is marked (blazed) with blue diamonds and leads away from the water.
Once on the trail, follow it to the summit, where you'll come upon the granite top of Harney Peak. Follow the trail up the stairs and metal walkways until you come to the fire tower. The view is stunning and the tower, built in the 1930s, adds an element of grandeur.