You meet the docent guide at the Fishermans Memorial. From there you head up Diablo Canyon Rd. to a locked gate where the docent lets you through and locks behind the group. This immediately leads to a series of switchbacks and a steep climb to a paved road. The paved road is followed for about 0.5 miles to the highest elevation of the trail. This is where you'll get back on a dirt path, starting with a very steep descent. There is a stop or two on the descent to take a break if needed. The trail then follows the cliff along the bay taking you through mostly covered terrain. At about 1.5 miles you'll come out to a viewpoint overlooking Avila Bay and the trail is fully exposed. The docent will then guide you down to the lighthouse from this point.
Hiking back out from the lighthouse
The first view getting back on the dirt trail.
Looking back at Avila.