Trailhead: From the 210 freeway, take highway 2 10 miles north. You'll see a small ranger station about a 1/4 mile before the parking lot for the trailhead (Map here).
Company: Friends, Dogs
Cost: $5 vehicle fee (more on that later)
Parking is $5, but I arrived after 3:00 PM on a Saturday, when the ranger station was closed, so I just parked and wished for the best (no ticket). While I would never condone attempting to sneak past Park Fees, it is something to keep in mind.
OTC Tip:There is a main parking lot right off of Highway 2. Avoid it. Follow the sketchy looking road down the mountain (I would generously call it a lane and a half wide). There is ample parking at the bottom. I love an uphill hike as much as the next person, but when it is on a paved road to get back to a parking lot, I'll go ahead and skip it. Save yourself the trouble and follow my lead.
The trail itself is mostly wide, enough to comfortably walk next to a friend or two. There are numerous sections where balancing over rocks is needed to cross streams, which adds to the fun. Even on a nice day, the trail was chilly, so bring a jacket. These trails are a great way to spend a sunny afternoon in LA, with friends and/or a dog.