If your idea of two-wheel fun is a car-free and paved path through a nature symposium then we've got a match for you. The Sawyer Camp Trail near San Mateo is 6 miles (one-way) of cruising cushiness along two reservoirs, Crystal Springs and San Andreas. Inline skaters, hikers, and baby strollers also enjoy this popular trail most weekends.
Several lakeside benches make nice snack-break spots, but better yet—picnic under the oldest and largest laurel tree in the state—the Jepson Laurel. This 600-year-old beauty, 4.5 miles in, has seen a lot of changes: grizzly bears, Spanish explorers, and even 1880s dance parties held right under its branches. After lunch the final mile climbs gradually uphill, so you've gotta do a little work, but the coasting on the way back is a crystal cruise!