Michael,
Wow! Those are fairly safe areas - especially out on 40th and Cabrillo. Be careful. I taught elementary school in S.F. and once read that "Everything I need to know about life I learned in kindergarten:" 1. When you go out, always go with a friend. 2. Look both ways before you cross the street. 3. Say please and thank you. 4. Clean up your own mess. 5. There's one more, but I can't remember it. But the first 4 are good advice for all ages - not just kindergarteners.
Marge