This is a moderate-to-difficult mountain ride of cycle heaven. The double track cuts through Anaheim Hills, where Walnut Canyon Reservoir (sorry, no fishing), Anaheim Hills Golf Course and clusters of never-ending suburban sprawl suddenly become serene and tranquil. But don't stare too long: The dramatic, high-speed drops will test the most experienced rider. The track is wide enough for a busy day, but watch out for horses. You can stay on the shorter, 3-mile Weir Canyon loop or complete the 12.1 miles and ride the Sherwood Oaks loop, too. Cyclists should save their energy and drive to the top because the climb is long and intense.