We have done it in a gas station washroom (no, we didn't touch anything but each other lol), public park, and in the stairwell of a building we were working in.
A friend of ours gave her a ride on his new Harley. She paid him back by letting him fuck her in the middle of the road bent over the bike while waiting for a train to go by. They finished the ride in a local park where she blew him in plain view!