San Diego has bike lanes everywhere where they're not needed, but as soon as you get to a narrow section of road or an intersection they disappear. It can easily add several miles onto a trip if you are unable to take the freeway. Many destinations are also build on the top of mesas, and because the place is so car-oriented things are spread out to a ridiculous degree.
I bike commute here, but it's maybe probably less practical or convenient than when I was commuting to downtown Pittsburgh or lower Manhattan. My commute would be nontrivial for someone of normal fitness & not much experience on a bicycle: 20 miles round-trip, 2000 feet of climbing, a portion along Interstate 5.