Ok, so psyclic's comments tar us all with the same brush, but you have to wonder at the fact that there are still private pilots out there that haven't sussed that not everyone like aeroplanes!
Even if it is legal to fly like this, does it make sense? Does this present private aviation in a good light or a poor one? What if the avoiding action for the kite had caused the aircraft to stall, crash and kill someone?
I think the point is that flying down the coast is nice, if done nicely.