I was on a Caribbean island driving around when I came to this 'tourist spot' which was a waterfall in the middle of a rainforest. I pulled into the parking area and I noted that there were no other vehicles around. So I locked up and started on the ten minute hike to the falls.
I started feeling adventurous in the forest by myself, so I unzipped and pulled my penis out. Walking down the path like that, I got hard. I wasn't really worried about meeting anyone. I got to a point where I could look down on the falls area and saw that it was deserted.
When I got down by the falls, I had an urge to go in the pool at the base of the falls and enjoy a little swim. But I had no swim suit. After looking around, I stripped down and got in naked. My heart was pounding because I realized there was a real danger of someone walking up and catching me there.
The thrill of being naked in such a primal place had me wanting to masturbate. I was rock hard in the cold water and I starting stroking myself. Then I decided that it would be more dramatic to climb up on a rock in front of the falls and let my semen shoot out in an arc into the pool. So I carefully looked all around again, then climbed up on the rock. Anyone who happened to hike in at that moment would have been confronted by my frontal nudity and full erection. I was a bit scared because I really didn't know what I would do if someone did come, but I was too thrilled by the prospect of what I was about to do.
I quickly started to pump myself with the waterfall pounding behind me and the forest around me. It was exhilarating! I worked quickly, not knowing how much time I had. I was rewarded by an awesome orgasm with my semen shooting beautiful arcs out over the water, just as I had imagined.
When I was done I quickly rinsed off and went to get dressed, using my handkerchief as a towel. I had just finished dressing and was starting to hike back when I met two girls and a guy coming in. I greeted them, hoping that I had not been seen, but one girl gave me a kind of look that made me suspect they may have been watching from the lookout above. At first I was greatly embarrassed to think they might have been watching. But as I walked back to my car I began to think it was kind of cool that I could have given them such an anonymous exhibition while enjoying myself so much. As I thought about the whole situation, I began to get hard again, so I stepped off the path and masturbated again in the forest. This time it was not quite so intense, but more relaxed and still very enjoyable.