Cass, I went to Lincoln beach recently with a friend and we had a fun day to say the least. Between us around 15 bucks in clad, and a bunch of misc. stuff. We didn't find anything worth reporting really though and the place is so junked up now it's difficult to swing without 20 pull tabs attacking you.
Ponchartrain beach is a different story though, one end is completely barren as far as finds have gone, while another section has given up a pile of clad, a buffalo nickel, a silver rosie, a watch, and a 10k ring (plate sadly) I plan to give it a rest until fall, and hit it again when there aren't crowds of people hanging out. It's trashy, but here in New Orleans, you have to expect that in public areas.