As you pull into the playground take a right hand turn onto a small road that is easy to miss and ends in 200 yards. from here walk into boulder fiend. Here is a pin, the one I have on this map may not be accurate, but this one is precise (41.4927050, -113.6270019)
If you go to the boulders to the right (The first cluster you see pulling in, you will be at Tiger King)