Lomas Santa Fe Drive. Experienced cyclists follow this route in Solana Beach east into Rancho Santa Fe, perhaps even continuing east on Del Dios Highway, past Lake Hodges, to Escondido. These roads can be narrow and winding in spots.
Mission Beach Boardwalk. A ride here is a great way to take in a classic California scene. Keep in mind this route is more for cruising than hardcore cycling, as the gawkers and crowds often slow foot- and bike traffic to a crawl. Mission Beach, San Diego, CA, 92109.
Route S21. On many summer days, Route S21, aka Old Highway 101, from La Jolla to Oceanside looks like a freeway for cyclists. About 24 miles long, it's easily the most popular and scenic bike route around, never straying far from the beach. Although the terrain is fairly easy, the long, steep Torrey Pines grade is famous for weeding out the weak. Another Darwinian challenge is dodging slow-moving pedestrians and cars pulling over to park in towns like Encinitas and Del Mar. La Jolla, CA.