My wife and I rode the "Guadalupe River Trail" three weekends ago. It travels through a few homeless camps that might make people uncomfortable. Also there was at least one point where we had to go onto a street to find the next section of the trail.
The San Francisco Bay Area should have the best bike system in the world, perhaps Google, Apple, Facebook and the like should move a little more money to bike paths instead of busses to shuttle their employees from home to work.
jeff