First, look at this face - happy, full of energy, and straight up exhausted all at the same time.
One of my favorite things -- both as a kid and now -- is playing games like "Daddy's Bed Raquetball." These are games that are made up on the spot, involve some element of a real game or sport, but ultimately are about getting really, really red in the face. These games can be played alone, but are more entertaining when played with peers who you can deride for being terrible at a game that has been in existence for 12 seconds. Other fun games that I have played like this include, "Indoor, no furniture mini-soccer," and "close-quarter, post-midnight dodgeball with unknowing player." Also, any game named using this formula: Try to hit x with y - with "x" being something ridiculous and "y" being any inanimate object.
Daddy's Bed Raquetball involved multiple objectives but basically was taking the above ball and hitting it repeatedly against the bedroom wall while at the same time defending Nathan (baby, not pictured) from stealing the ball (Lucas) or falling off the bed (Daddy). Good times.