On Trans Atlantic flights I just drape a fleece blanket over me and slide out my cock and tug away.

I've also made use of the bathroom on flights many a times.

In the car is a natural, though you have to be careful not to wreck.

I've done it in numerous porno theaters and arcades.

I'd love to have some hot little thing watching and joining in.

I don't know if it's the "best" place but the public places I've jerked off in are -

Car Parks - in and out of car.
Car whilst driving too.
Public toilets.
Office at work whilst at desk and in toilets.

Late at night I've been known to wank outdoors in the garden whilst having a cig.

As much as I've fantasised about doing it more publicly I can't see me taking that risk.

I have jerked off in:
tanning booth
hot tub, with and without wife
steam room, with and without wife
work, in own office
forest preserve while camping, with wife
adult theater, once
car
back yard

Lots of great places. You just have to look for them. My personal favourite is a beach at night. You have total freedom, you can go nude and take your time!

That's hot mate. I've wanked on hiking trails, car, public toilets, at work.
I would love to wank with someone watching

I've jacked off in tanning booths, adult theaters, peep shows, in a bushy area of a river bank, a city park, in a college class room, in the backyard sunbathing, under a bridge and public restrooms. It might be easier to list the places I have never jacked.

Cars, train, plane, cab, stadium, park, restroom, theater, porn booth/theaters, beach, rooftop, windows...

When I was yonger lived in a somewhat rural area, would take walks into the edge of corn fields. occassionally would pop into a field, remove all my clothes and leave my semen to fertilize the corn. What fun!

I thought that popcorn tasted a bit funny

My favorite places are korean spas. These same sex "straight" spas are great! Nudity is required. Always can jack openly in steam room. Best yet..they have overstuffed leather chairs insleeping rooms where it is always common to find at least one other buddies to jack with. So much fun!

As a student tree-planting, I would often stop on a sunny day and start playing with myself.
The sexy college girls working off in the distance would be oblivious to me, but I would see them bending over and down. mmmmmm The skimpy tops and shorts!!!!

I would shoot a hard, wet load and then get back to planting!

Where are the best places to jerk off & show off in Vegas?

it's hard to me to list every place i jo in public as there have been so many. but some of my favorites are class in school, library, restaurants, movies, theaters, getting haircut, stores and mall, elevators, cars as passenger, basically anywhere i can!

Another one here who has masturbated his GF during a flight - transatlantic overnight under a blanket at the back in coach where you can raise the skinny little armrest between seats.
We'd already been flying all day, and the natural scent coming from between her legs was already driving me wild.
She didn't need to even touch me. We both climaxed at the same time.