I envy those that don't live in coastal SoCal; bikes break free here all the time. When on tour, I'd avoid having to shop in dicey areas whenever possible. Usually I could grocery shop in a nicer area closer to the campground or room, ideally within walking distance. If I had to lock the bike, I'd put it out front in full sight--it's amazing how many bike racks are hidden on the side or back, so that thieves can conveniently work on your lock in private.