According to this article in The Guardian, our fearless leader—when not holding his hands over his ears and bellowing "Row, Row, Row Your Boat" to drown out all that war protest nonsense outside his front door—is into some heavy reading during his five-week vacation:
Salt: A World History by Mark Kurlansky
Alexander II: The Last Great Tsar by Edvard Radzinsky
The Great Influenza: The Epic Story of the Deadliest Plague in History by John M. Barry
My theory is that he's just flippinig through these tomes wondering where all the "neat pictures" are, dammit. Such books are a waste of time for the President. He ought to work his brain over something like War for Dummies or Help Me, I'm a Big Huge Liar. Grrrrr.
Also according to the article, the President's former speechwriter David Frum said his old boss is, "often uncurious and as a result ill-informed." Which seems to me to be quite the understatement.