My wife is pretty shy about that kind of thing, but I love outdoor stuff and she's very slowly coming around. We've had car sex a couple of times. Once parked behind an empty house, I had a big SUV at the time and we folded the back seats down and left the doors open because it was summer in the south. All was good, it was night and we were very quiet, until we were done and I fumbled my key fob, set off my car alarm (complete with flashing lights that illuminated the whole yard) and fell flat with my pants around my ankles ?.
Same car at night in an empty parking lot across from where her parents were staying. Doors were closed that time as it was a lot more exposed and thus the only time I've literally steamed the windows of a car completely opaque. Literally had to clean the inside of the windshield with a napkin to see to drive her back.
My area is right up against a national park and with all the public park land and trails that comes with, we started in the night at a river beach but had barely started to undress when headlights started coming down the dirt road. Afraid it might be rangers we jumped back in the car but she said "hey, unzip your pants and start driving" then sucked my dick until we got to a different trail. We parked at the trailhead and I bent her over the hood. Actually while we were there she saw one of those "no horses" signs some of the trails have, laughed, and said "looks like I'm the only one you're allowed to have sex with here".
On the beach at the river at night. Nothing super interesting to tell there story wise except that there's an overpass that goes over the river where cars pass maybe 250 feet away. We finished on a pedestrian footbridge across the same river.
On the second story balcony of a condo at night with a busy downtown four lane maybe 100 feet to the right that has us in full view and her mom asleep in the other room.
in the river on an overnight kayaking trip. That night we had all expressed interest in swimming before bed. The two friends we were with gave me a "go for it" look and we're like "yeah we'll be there in like 20 minutes". The water was crystal clear and flowing so me and my wife stripped and waded in waist deep. One of my favorite experiences, plus no cleanup!
Basically all of my zoo experiences were with horses on my parents' 30 acre corner lot, with a highway running the full length of one side and a dirt road the full length of another. I tried to convince the mare that we should really go where we couldn't be seen from the house or the road but sometimes she wanted it right where she was whether I liked it or not ?. So more than once I was in full view of either the dirt road or highway and every time I heard a car coming I would jump off the bucket, tuck my dick into my waistband, and pretend I was brushing her. Had a close call with a motorcycle once where he definitely had enough time to see me balls deep in mare pussy before I could scramble down but I guess I'll never know.