This epic loop begins with a brief road stint along Trabuco Canyon where you'll enter O'Neill Park and gradually work your way towards Santiago Canyon Road via some exciting scenic double-track. A brief ascent up and over Modjeska Grade will warm you up for the main grind up Harding Truck Trail. After another significant fire road climb, this time along Main Divide, you'll pass up and over Santiago Peak before descending Upper & Lower Holy Jim singletracks. You'll definitely be working hard on the front side of this route but the Holy Jim descents are truly a worthwhile conclusion!
11/10/13 Got my exercise and then some. This is a great route. The loose singletrack hike section right before the peak is a dirty trick when I was expecting the easy fireroad climb, though! Lower HJ is in perfect shape.