Go past the Manning Park Lodge and turn right after the lodge. Follow the road and when you see a fork, stay left. Park at the parking lot. There are pit toilets here. Cross the dam bridge and you'll see, Frosty Mountain sign. Go right and follow the lower trail...save Frosty for a nice summer day or a fall hike to see the Golden Larches (see that hike under, My Hikes).
This can be a loop trail that follows the lake along. You are in the trees. Soon you come to a bridge named, Rainbow Bridge. You can go across the bridge and go to your right to loop back to the parking lot. You can also carry on to the neighboring lakes, Strike and Thunder. However, this will make your SS a lot longer (14 km's). Today we were breaking trail so we decided to make it a shorter loop. That's the great thing about this as a SS...you can turn around at any point.
The trail is easy to find in the summer but with fresh snow we lost the trail a few times and ended up on the cross country skiing road. They can be a little nasty so we quickly found the trail again and got off the road (LL Day Use). We followed this unbroken snow trail down a path and along the lake. Soon the parking lot was in our view. Happy & safe snowshoeing.