Well, here we go!
Overview: This is a very easy hike down a wide dirt road that leads to a pump station on the north end of San Joaquin Rd. Although not a trail in the typical sense, it is labeled as one on the Tucson Mountain Park map, and does provide access to several other trails in the area.
Hike: From the pull out, walk around the locked gate and follow the dirt road as it heads west. Although rocky, the road is wide and easy to follow as it slopes gently downhill towards San Joaquin Rd. I believe this trail would make an ideal location for an evening stroll to watch the sunset, or a great introduction to night hiking due to how easy the trail is to follow.
Pay special attention to the south sides of the road as you walk, and you will notice several trail junctions marked with cairns. Although none of these junctions are signed, the Tucson Mountain Park map names these trails. In the order you will encounter them, they are: Campground Trail, Triple C Trail, and Prospector Trail.
The end of the trail/road is less then spectacular, as the road ends at a large fenced off water pumping facility. Despite the lackluster finish, the trail provides decent views of the Tucson Mountains and Gates Pass.
Gate Policy: If a gate is closed upon arrival, leave it closed after you go through. If it is open, leave it open. Leaving a closed gate open may put cattle in danger. Closing an open gate may cut them off from water. Please be respectful, leave gates as found.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.