There are a few areas at Golden Gate Canyon State Park, but Forgotten Valley is my favorite. Access to fishing at Tallman Ranch Pond, and Monutain Lion Trail leads to the summit of Windy Peak.
Forgotten Valley has 4 backcountry campsites and a backcountry shelter for overnight camping. All backcountry tent sites and shelters are first come, first serve. You'll need to check in at the visitor center to reserve the campsite, and pay for a park pass.
Park at the Bridge Creek Trailhead, and take Burro Trail to access Mountain Lion Trail, which leads into Forgotten Valley.
Site #15 is my favorite in Forgotten Valley. It's settled in an Aspen Grove, and is more secluded that the other sites.
Bear lockers are available for each campsite.