When I was in college, I got fucked in a botanical garden after hours by a security guard. Very atmospheric.
My ex also had me suck him off in the car on a long road trip, parked at in an empty church parking lot. He also tried to fuck me in a random shady bar bathroom in the French Quarter of New Orleans, but that felt a little too scary.
A patch of daisies beside a river at a park
It was secluded, but still risky
Also, the obligatory teenage car at the side of the road
The middle of the day was probably not as discreet as I thought it was at the time