Cool vid, not sure about shooting in monochrome though. I would think it better to convert the movie in post so as to retain a colour original if you ever wanted.
Still nice work, I always enjoy your vids and always find there is something I can learn from watching your boy.
That Canon sensor is incredible. Nice shooting, good choice of music, well edited. And the riding is just ridiculous. There's a two foot hop he does at one pint while riding the board backwards allowing the board to come around - unbelievable.
Regarding the B/W shooting, one thing I would be inclined to do regardless of how you shoot is to grade this by pulling the blacks... just a little more contrast as the late afternoon light has left you with everything sitting in the middle of the scale, no whites or blacks. I think this would highlight your subject better.
Is there anything that kid cant do 
Amazing!!
