ha ha...this is really funny! maybe they thought it someone can do sand surfing, even swimming might be possible...so lets apply the rules before it even becomes a reality :)
ha ha! yes, Common sense is useful from time to time. ;-) 10 points for that.
perhaps you could have found better light at another time, so "only" 9 points. ;-)
Did you notice that the bountains behind look like two people are slipping together. With one face and another face with it, but this has the body too. Close your eyes a bit and concentrate you might make out.
Looks like a 1970s western movie. And I don't mean because of the setting, but the look of it. Good one. Just needs a cowboy looking puzzled at that sign and you have it.