The roof of my building is nearly hidden to nearby housing (it's a whole floor taller), but it can be seen from a high-profile office building a block away. Been out there in daylight, but when I go up, it's usually late at night. I took a one-night stand up there, too, and after blowing me for a while, she wanted to climb on me and do some stand-up fucking. I've been elsewhere, too, like in the middle of a stand of downtown trees at night, on a public beach at night (never been to a nude beach, let alone an adventurous one), on the same beach in the water in daylight, in hotel pools, in a large hot tub with a very cute Asian girl nearby (all the bubbles hid everything), etc etc. Naturally, I wish I had someone along to share the experience.