Follow signs in the parking lot to the trailhead. Start a 1000 ft climb on fireroad then descend to the lake. Take a left around the perimeter of the lake until you come to the Flume trail trailhead. The trail is mostly singletrack with sparse technical sections, but overall an easy ride on the mountain ridge overlooking Spooner Lake. The views are spectacular. At the 10 mile mark, you can connect to the Tahoe Rim Trail to head back to the parking lot or follow the signs to the shuttle bus. The shuttle will take you back to the parking lot for $12.50 or you may opt for a gradual climb of 8 miles on the road back to the park for free.