I vape just about everywhere. I vape openly at work, where everyone is so amazed I was able to quit smoking that they just sort of accepted vaping as a miracle that's entirely appropriate indoors. I vape openly on the street, of course, too.
I places like malls and supermarkets I vape in a semi-stealth fashion -- openly on the inhale (no one seems to think I'm doing anything but chewing or sucking on a big pen), but stealthily on the exhale.
And this past weekend I stealth vaped on two planes, several buses and a couple subways. Nobody even noticed.
One thing to consider in workplaces -- the irrational fear of second-hand vapor can happen, but it's based on the idea of nicotine getting into other people's lungs. However, I've noticed that some folks assume that e-liquid doesn't have any nicotine, that it's just flavored steam, and those people don't give a hoot about second-hand vapor. So if people assume that, you might not want to disabuse them of the notion.
In any case, being that vaping is the only thing keeping me from smoking, and therefore from a shorter life and probably a very nasty death, I am NOT above telling potential busybodies that I vape 0 mg juice (I'm actually an 18-24 mg guy). It's a white lie I'm very much willing to live with.