The upper tier is a tall piece of sandstone about 90 feet tall 100 feet across. Most of the routes are top rope due to the fact that it is unsafe to put bolts on the sandstone face. To reach the top from below, trek up the 3rd class gully on the left side of the rock. Usually you'll set your anchor from a tree, though old bolts are present at the top of the right-most climbs. The odvious crack in the middle of the rock is known as Chouinard's crack (5.9) and serves as an easy reference.
Getting There
Be aware of lots of poison oak in the area
To get to the Boy Scout Rocks, head into the park from either entrance, though the south entrance is a little closer. Park at the Rock City picnic area, and head south road on foot. A little ways down (150 yards or so) you will see a large rock (60'+) on the right with an obvious large crack in the middle, and a CLOSED climbing area. Don't climb this rock, or other areas in the park will be endangered as well.
Instead, hang a left downhill on a trail a little past this rock. There are several trails, most are infested with poison oak, so beware. One steeper trail that is LESS infected is found by locating the top of the rock, which is a little downhill from other paths. It is also located just to the left of the top of the upper tier, which stands about 15 feet tall next to the road. Follow this steep windy trail down about 50 yards, and you will be standing in the corridor between the upper tier (uphill) and the middle tier (downhill).