Sounding nice and lots of power is a good perk, but i dont know if he would look too cool when he gets stuck in the soft sand trying to back jetskis into the water. Unless he plans to modify it with huge wheels, lift, ect......its just not worth it for jet skis and quads.
Where are your boat launches at where you launch in sand? I don't know about you, but in Washington ours are made of concrete and such.