Mount Diablo State Park offers sweeping summit views, a network of trails, and campgrounds that accommodate small towable rigs, making it a top day trip from Clayton. Black Diamond Mines Regional Preserve combines mining history with varied trails and trailhead parking suitable for a quick stop with a micro trailer. A scenic drive along Highway 4 and short connections from Interstate 680 reveal rolling foothills, reservoir pullouts, and picnic areas ideal for parking and short hikes. Downtown Clayton provides easy street parking and nearby services, so you can return to camp for a relaxed evening.