For our preparation day, I suggested that we travel south to Casperson Beach which is reputed to having good shelling and some prehistoric shark teeth. The beach is about 45 minutes drive for us. The beach isn't as nice as some closer ones here in Sarasota. But there were lots of shells though mostly smaller ones.
Although we didn't have any equipment (screens) for finding sharks teeth, I spoke with some people who had found several. The process is to scoop up some sand and shells in a screen or strainer. The sand falls through the strainer leaving only the shells and perhaps some sharks teeth. The teeth I saw are black and about 1/4" in size. Not something one would display on a shelf.