It's just a big field, plowed occasionally to turn up fresh dirt. Visitors look through the plowed dirt, looking for diamonds.
It's a unique place. Kind of fun, for the first half hour or so. (Then a little tedious.)
Is there a way to know ahead of time when they plow the field?
Also, I seem to recall that at least at one time there was a private individual who offered something similar to the park itself. Is that option still around?
But here's a tip-- they say if you go looking right after a rain, the dust is wetted down and the diamonds are easier to find. So they say, I can't say for myself.