The sight drop on the map seems to change, due to the dual nature of Skyline Boulevard (it has the same address at the preserve on Skyline just south of the Joaquin Miller Road intersection, as Roberts Regional Park's 115000 address UP Skyline Boulevard FROM the same intersection. If coming from Joaquin Miller to the south, cross the intersection with the light. It becomes Skyline. make a turn through the island in the middle of the road into the loop shaped parking lot which is visible on the map. If coming up Skyline from the south, simply pull into the lot, which is the only possible right turn BEFORE the intersection mentioned above, where from this direction Skyline BECOMES Joaquin Miller Road. :-D