Well, I hope I get this right. The instructions say "go somewhere you are not supposed to go". I used to do that as a puppy, but it was because you know, when you gotta go, you gotta go!
I learned, though, and now I only go where I am supposed to go, that is, outside. Sometimes, like the tab to the right here says, I mark my territory, sure: trees and car tires and all that.
Anyway, I didn´t go where I wasn´t allowed to recently, and wouldn´t have proof of it if I had, either.
But I am under the impression that the "go" in the instructions could be interpreted in a different way, and I hope my interpretation is not too big of a stretch, and well, this is my first task completion alone and I am not very sure of things yet.
So, what I did was to enter a place which is forbidden for me.
You see, we dogs are not allowed to go into public restrooms. Well, I am not sure, maybe some dogs are allowed. I don´t know every dog. I wonder if Poncho is allowed. Geez. But I know that I am not allowed to go into public restrooms. Ever. No matter how thirsty I am. 
And last week I went into one, my first public restroom ever. Oh boy, was I excited! Lots of interesting smells there. The proof that I trespassed there is that I saw this thing.
I can tell you that it was a little too high, but that didn´t matter anyway because it had no water. Pity.
Now, I didn´t have a camera, but I met this guy there, who happened to be taking a picture of the thing. So I asked if he could send it to me. He is not a SFØ player but who still carries a digital camera everywhere, specially to public restrooms, it seems.

(The captions in the pictures are Martin´s comments, who asked me to include them, because he thinks that was a particularly notable public restroom. I wouldn´t know about that).