Originally Posted by
tyrion
Easy = minimal hills (except for down hills) and relatively traffic-safe.
I live in the LA area but if I lived in SD and wanted a relatively easy century ride, I'd take Amtrack north, get off after 100 miles then ride home on the coast route. It would be a one-way trip.
My plan is to do this from Santa Barbara. The train lets you off at State Street in Santa Barbara and then I'd take the coat route home. A similar plan could work for you.