As the previous post was a bout the car it seemed logical to talk next about the parking sex Option.
It can be an outdoor one or a building one or one underground. Each having its own pros and cons. Be aware that most have cameras and that you don't want to be recorded.
You can stay in the car, hide between two cars, etc ... There are so many options.
Outdoor car parks are somehow easier for group fun, based on my own experience.
Dark underground ones are perfect for submission challenges like being naked , cuffed and instructed to start from point a and go to point B with being seen.