Personally some places i'd really wanna try jerking off are
- Train/Train Station
- Public bathroom @ the Urinal
- Behind a building? like in daylight
- In the car on the highway
- Elevator??
Not sure where else? What about y'all?
(i've already done on a bus, Public bathrooms, In fields/ driveway, many other public places)

(if you can't tell i get off on public jerking )