Probably the most forbidden place would be in the hospital where I work. "Tobacco" is forbidden and signs stating as such are up at every entrance. Well, technically I am not using "tobacco", but I do vape discretely by my locker in the locker room. I only vape in front of a few trusted fellow co-workers, otherwise I abstain if I'm not alone.
I've stealth vaped in the movie theatre, using the usual stealth techniques. I try to sit in the back, just in case some vapor escapes to distract other viewers.
I occassionally take a toot on my Provari and cartotank while grocery shopping. I don't think anyone would mistake it as a cigarette, and I usually only vape in empty isles. Store employees, including a manager, have caught me vaping, and ignored me.
I recently went to an outdoor concert event to see Journey, Pat Benetar, and Loverboy. I specifically asked a security girl if she minded if I used my Provari and BB within the arena, then held them out for her to see, and she said no problem. I didn't even have to explain what they were.
I also brought them to a Bengals football intersquad scrimmage at Paul Brown Stadium. The security people were checking for weapons and alcohol, but the security guy waved me on in thru the gate with both of my mods in my hands.