I used to live near a local park with a lake. Sometimes I would jog or walk early in the morning and go past the park. Occasionally I would go into the park and down through the forest trail to the lake (about a 1/4 mile away from the road) to stand or sit on big rocks by the shore of the lake just to enjoy the peace and solitude.
One time I was there before sunrise (although it was light enough to see) sitting on the rocks listening to early morning sounds. I had not cum in a while, so since I had a pent-up load to release I started to masturbate right there by the lake. I was pretty confident that there was no one around, so I decided to remove my t-shirt and shorts and sit on the rocks naked except for my shoes and socks. I loved the feeling of being naked outside in this public park with my cock hard as the rocks I was sitting on, exposed and jacking off. Once I got going I continued to jerk-off until I shot my ropes of cum into the water. Whenever I jerk off outside I have really satisfying orgasms, and this was no exception.
After the first time, I sometimes knew when I started out I was going to go to the lake to jack off. I also knew that the specific place that I liked to go was where men liked to fish later in the day, but that fishermen sometimes liked to fish early in the morning. In spite of this, I always stripped naked and either stood by the shore or sat on the rocks and jacked off. There was a thrill in doing it naked with no way to cover up, and although I did not want to get caught, the thought that one or more fishermen might show up at any moment usually caused me to ejaculate with intensity.
One time I walked naked a short way up the trail away from the safety of my clothes, stroking my cock as I walked, before returning to the rocks to finish pleasuring myself and blasting my load of semen.
All told, I repeated this naked lake jerkoff scenario probably a half a dozen times. The last time I went into the park with the intent of getting naked and indulging myself by the lake, I was standing on the rocks enjoying the view and had not yet pulled out my cock or removed my clothes. I was only there a couple of minutes before I heard two fishermen walking down the trail to come fishing on the rocks. I said good morning and then continued on my way and that was the end of my jacking off down by the lake.