» Trail Map by HikingInBigSur.com: Trails around Partington Cove area are clearly shown in this map.
» Official State Parks Brochure: A decent map that shows all the trails in the park
The route is well described in an article at HikingInBigSur.
Summary: From the trail head, descend towards the Pacific Ocean along a wide dirt road to reach a fork. The trail on the right goes down to a rocky beach. The trail on the left goes over a bridge over Partington Creek, then goes through a tunnel and reaches Partington Cove. The trail ends in a rocky promonotory which may be explored by walking and scrambling. It is possible to go all the way to the other side of the promontory to (see the Google Map with GPS tracks).
Tan Bark Trail: You may complement the Partington Cove hike by walking along Tan Bark Trail in a cool shaded redwood canyon that lies on the other side of Highway 1. For the first 0.4 miles, Tan Bark Trail is shaded and meanders next to a cool creek, in sharp contrast to the unshaded Partington Cove Trail. You may take a short walk (0.8 miles round-trip) or you may complete a strenuous 6.3-mile, 2000-ft loop (Tan Bark Trail → Tin House Road → Highway 1) described here.