First and foremost, always get permission to hunt a site, even when it is a public place like a beach or park, one way Ito get permission is to offer a free service, for instance, ask the caretaker if they would like you to remove all the sharp metal objects buried in the sand, like flip tops, and crushed cans, provided you can keep or properly dispose of what is found, they are more likely to allow you access if they get something useful out of it, like having their beach cleaned and unsafe items removed, and feel free to show them what hazards you have removed from their patrons harm, so they will allow you to return often, of course you don't show the coins, jewelry, or valuables you also sifted out of the sand