I did a f2f transaction with a members sister on here who brought along her bf, I didn't mind. She was a young girl and perhaps thought that she was going to be trading with some 80 yr coin nerd who wears dirty track suits with sauce stains. Source: webz
Conduct F2F high value transactions with unknown buyers inside your local police station lobby FTW. If they're hesitant about the lobby, then maybe in the parking lot. F2F with known, repeat customers can be done in a more casual public place as others have mentioned...just use your instincts.
What do the Police say about you using their lobby? Sounds like a good idea if you do a BIG transaction.