Hmmmmmm, what a question.
For me, I would probably be in the Ferris Wheel at a regional theme park. I had gone there with a long time friend and occasional GF, and we had spent the day having fun and flirting with the occasional guys. When it got dark, we went on up and I could not resist.
Now this is the type with high sides and a cabin, so people can sit facing each other or side by side. So I moved next to her and started to feel her thigh. She looked so adorable as she bit her lower lip and parted her thighs a bit more, so I unsnapped the top of her shorts and slid my hand right inside her shorts and panties.
I knew we only had a few minutes, so I started to finger her already wet pussy. I only had to be careful that what we were doing was not to obvious to everybody else. After 3 or 4 trips around she was squirming and clenching on my fingers as they pumped in and out. I pulled them out and worked directly on her clit and she was cumming in no time.
I kept my hand there, and then they paused the wheel with us at the top to let more people on and off. So my fingers quickly went to work again, giving her another orgasm right as the car started again. We had barely gotten back "decent" again (me licking my fingers clean, her refastening her shorts and pulling out her T and tugging it down to hide the wetness in her khaki shorts) when it was our turn to get off (of the ride).
Then came my second most unique place. Getting my pussy eaten in the backseat of my car in the parking lot of a regional amusement park.
