Oof, so many places. I used to work at a super fancy hotel a few years ago. I jerked in the back office, lobby bathroom stall fully nude, and in front of the bathroom mirrors and sinks fully nude, the bar, the stairwell fully nude, the gym, and in the banquet hall fully nude with one of the guests who I found on Grindr. (he was sharing a room with a coworker so we couldn't go to his room)
I also jerked it in a lot of the rooms. It was in the business district of the city so most of our guests were 30+ men. I worked overnights so I'd leave before housekeeping came in. What this meant is that if someone checked out it would be my responsibility to take a quick peak in the room to make sure everyone was gone and the door was locked since housekeeping wasn't around. I'd either put a BRB sign on the desk or if we weren't short staffed I could tell the other desk person I'd be back in a few. If the guy who was in the room was hot I'd blow a load all over his sheets. Found boxers and briefs a few times too, would always blow a fat load in them thinking about the man that walked out in a suit just a few minutes ago. You'd be surprised how many guys forget used underwear in hotel rooms.
Outside of that I've jerked in at least 10 truckstops, a countless number of hikes, the back porch of a cabin I stayed at with some buddies during a bachelor party after they all passed out, in my straight married neighbors briefs from the laundry hamper when I housesat, tons of locker rooms, my car, in a buddies barn with him, parking garage, and my personal favorite/greatest accomplishment, on the showroom of a carpet exchange with an employee who hit me up on grindr. The last one was super hot because idk if he was the owner or if he was just an employee but they had just closed and he opened the back door nude with a hard on. Hot as fuck.
Been a while since I've had a jerk adventure, not as daring as I was when I was younger.