In our area, if the boat's design does not provide a safe riding position, the law enforcement folks don't mess around with bow riding. They don't fool with what is and what is not legal as far a parts of the body outside the boat. Generally, you get an enforced stop for negligent/dangerous operation (a more serious offense than bow-riding), a mandatory inspection and a real expensive ticket The water stop usually costs the boat owner at least an hour as he listens to the lecture and goes thru the safety inspection. Depending upon his attitude and what the inspection turns up, he gets either a warning or a ticket.
Like Dave, our boat has a trunk cabin and a wide walk-way all the way to and around the bow. It is quite safe to ride there if you are seated on the cabin and your feet are on the deck. Since I make the speed decisions, when guests wish to ride on the bow, we run below planing speeds.