Wanted to share one of my favorite solo experiences. Was horny as usual and wanted to jerk off outside, as it was a warm night, but I live in a crowded area with no real privacy. Then I remembered a public golf course near my house. Bingo. Drove there and parked inconspicuously, cut through some bushes and found myself in the middle of an urban area at night with absolutely no one around.
Walked to the middle of the course where I took off everything but my shoes and stood under the moon with a raging boner. I don't think I'd ever been nude outside since childhood, and it's quite a nice feeling if you haven't experienced it. Walked all over the course jerking off (like I am right now) and finally came on one of the tee boxes. If you're looking for an empty outdoors space, give it a try. I've been back a couple of times since.