Hwy 102, R onto Silver Falls Rd.
Follow road to the R when it becomes Sheilds Rd. Watch for a small sign to Silver Falls Provincial Park on your left. Follow this very rough road downhill until you reach the beach.
Drag this map down until you can see the south end of the lake. At the correct size you should be able to see the road that turns off Sheilds Rd and goes down to a beach.