DEAR MISS MANNERS: I hired a private guide at a tourist attraction. It was an enigmatic place, so the guide often got questions from other visitors trying to figure it out on their own. People even asked him to take their pictures after he took mine.
Is there a way to tell people who interrupt my tour to make requests of my guide that a book would explain the buildings, a guard can show the way to the toilet, and another tourist can take their photo?
GENTLE READER: Yes, but do you really want to get into altercations with tourists in need of toilets?
Neither will your guide, but as he is in your employ, you can tell him that you find this distracting and ask him to decline on the grounds that he is busy working, and there are others around to help.
That said, Miss Manners asks you not to mind if people simply want to listen silently to what he is saying. Or if they only need the simple, humane courtesy of being pointed toward the bathroom.