Depends on the definition of unusual. My list would include, driving down the interstate, outdoor hot tub (at a hotel) in the middle of the day (strangely empty, think the couple on the balcony knew what was going on though), dressing room (the clean up was the hard part), and that is all I can think of at the moment.
the most unusual place I would say is while driving down the interstate. I love to take off my pants and drive uninhibited. Can't do that often, though. I have done that a few times.
I regularly wank in my clients driveways in my car. even snooped in their houses and wanked off in bathrooms, hallways, bedrooms... especially if I find leather gloves or boots or coats or, well just about anything leather actually!!
once..on the bow of my boat...full moon...crowded harbor..
my ex lady friend dared me..
i won the dare and the prize was her very best blowjob later that night...she really outdid herself..lol
Two weeks ago while camping on the rim of the Grand Canyon, got up that night went out and jacked off and let it fall into the Canyon. Wondered how many Indians and early pioneers had done the same. Full moon and it was outstanding wish I had my camera, but was lucky I didn't fall in.
Pulling guard duty in a tower at a nuke site in Germany while in the Army. Got the urge, made sure my M-16 was on safe, lowered my fatigue pants and took the snake out and gave it a good pounding. The result flew right out the window and no one ever was the wiser. It sure felt good.