One thing I did was try speaking with the head of parks and recreation. I had someone complain while I was at a ballpark, so I called the parks and recreation manager to find out if it was true that I was not allowed at that ball field. They said it was indeed true. So I asked where in town it would be OK and they gave me 3 different sites to try. One site I got over $50 in clad and a corroded hard times token from 1833. The other I got about $30 in clad, a silver ring, 1943 quarter, and a 1936
Walking Liberty half dollar. You could be just a phone call away from finding a good spot.
It is also worth asking farmers who own lots of corn fields. Ask if it's OK to search as long as its not planted. I've gotten my best finds in corn fields.