Walking is amazingly free of worries. I thought biking (in urban areas) would be the same but at higher speed, it's not. When you get above 25 you become dangerous and cannot be mindless. Also securing a bike is nearly impossible unless in protected parking lots or private homes. (I've read many reports of robbers "hacking" into buildings in case some people left their bikes unlocked or with subpar safety mechanism).

Maybe with a cheap bike tracker in the frame...