There were definitely multiple spots along the coast that were sketchier riding that SF. Once you ride along curvy hilly roads with hardly any shoulder and cars looking at the ocean rather than you flying past at 45mph, you’ll welcome the bike lanes all over the Very bike friendly city of SF, with light traffic never going over 25mph max, that is used to driving with cyclists. Hell, there are enough paths you could probably practically avoid the streets most of the way of it were that much of a concern. As mentioned, you can be through SF very quickly if you wish, though I’d argue that you shouldn’t unless you just hate being around people. I’d recommend at least stopljng at the Japanese gardens there. They’re Really cool.