The final quarter-mile of the infamous Bulldog climb can be seen along the right skyline. I’d just struggled up that a few minutes before. An elevation gain of 1700 ft. in 3.5 miles sounds not-so-hard sitting in front of a computer, but the climb has few breaks and is longer and steeper than those figures convey.
The Bulldog climb is part of the ~14.5 mile Bulldog Loop — an excellent course that is popular among runners and mountain bikers. My Polar HRM says the elevation gain/loss on the loop is about 2700 ft., and a quick calculation using the elevation profile in Sporttracks gives a gain/loss of 2500-2600 ft.
In 2004 Sal Bautista ran the slightly shorter version of the loop done in the Malibu Creek Trail Challenge in under 1.5 hours! Here’s a Google Earth image of a GPS trace of the Bulldog loop.