I park at Inaja Day Use Area. Free parking. No overnight camping or parking. Strictly enforced per Ranger. I walk east basically straight to the picnic area, about 100 ft, then down stairs toward a picnic table 40 ft away. Before I reach it I look for a trail thru the brush on my left going down. The trail is steep most of the way down with a few rest spots; about 200 ft vertical drop. Includes a scramble over a very large boulder. Avoid side trails as they end soon. I wear sturdy boots. Long pants. Watch for poison oak. I cut it back in several places last fall. About 5 min hike down for me; and 15 min back up with the steep climb and my new found gold hoard. With a 20 lb backpack of detector, 2 classifiers, pan, jug of water & food. Call me a fit 60+ Big John.
On site you immediately see Coleman Creek meets San Diego River. A sand pit where you stand. Coleman Creek is bedrock going left upwards. Topped with rocks & boulders of various size. It's accessible with high banks both sides. I trimmed the brush for easier access upstream for a ways. To your right is the SD River with lots of boulders slight down grade for a good ways downstream. I walk in the stream bed. Before the brush thickens and the creek starts its drop. I haven't ventured beyond the easier parts in either direction.