As someone who runs a high-end road bike rental company, I am often asked where to ride while my customers are in town. For some areas, this is a very easy question to answer while other areas pose problems. Not all areas have large numbers of rides easily accessible from the hotel where a customer is staying. Fortunately, most of San Diego County, especially the north county, has thousands of bike rides that are accessible from your doorstep.
One local club, the North County Cycle Club (NCCC), rides the roads of the north county of San Diego all the time with occasional trips up to south Orange County through Camp Pendleton. Someone with the club has put together an incredible resource for cyclists that allows you to search for San Diego County bike rides based upon your start site. It can be found here: http://bike.fullcommitment.net/.
The best part of this link is that it provides you with a map of San Diego County with potential start sites highlighted in red. Click on the red dot and you can see a list of rides from that spot. Click on the ride link and you’ll find a small map of the ride. Click on the “view full route” link and you’ll get a larger map and printable cue sheet.
Other resources for rides can be found here: http://socalcycling.com/training-rides/. Here, you’ll find a list of regularly scheduled training or group rides that are a lot of fun, especially if you want to find a more competitive ride.
Having grown up in the north county of San Diego, I can be a bit biased. I feel that for the sheer number and variety of bike rides, it’s pretty difficult to beat this are for riding on the road. Though some roads are high traffic, there are plenty of wide bike lanes, and it’s pretty easy to find lower traffic areas to ride, as well.