Laguna Beach and the surrounding coastal mountains and canyons features some of the finest mountain biking trails in the world, including the (in)famous Volvo "Car Wreck" trail, with 1,000 of elevation gain (or loss) and an overall rating of 8. The trail is equally suited for trail running and hiking.
There are numerous ways to incorporate the Car Wreck trail into a larger loop through the Laguna Coast Wilderness and Aliso Canyon Park, but a common route is to begin at Alta Laguna Park at "Top of the World" in Laguna Beach.
Take the West Ridge Trail .5 miles, bearing right onto the marked Car Wreck Trail. Here's the route increases significantly in technical difficulty. Eventually you'll pass the famous Volvo car wreck. From here, loop back on the Mathis Canyon Trail until it reaches the West Ridge Trail, which will take you back to the parking area.
Looking for more options near the Laguna Coast Wilderness?
Mountain Bike Bommer Ridge & Emerald Canyon
Trail Run the Boat Road and Laguna Ridge
Hike the Water Tank Trail