In Santa Cruz, down on the beach next to the boardwalk is the mouth of the San Lorenzo River. Running over the river, and behind the boardwalk are some train tracks, and a Trestle. That also has a small foot path over it on the side. The river under that trestle is very wide and shallow. You can wade across it in the summer.
As a kid, in the 80's, I remember a guy who had dove from the trestle into the river. Hit the bottom and broken his neck. He sued the city. They had to put up "No Diving" signs all along the foot path.
Why cant we replace all the "No Diving" signs with "No Dumb Asses" signs.