I can think of a lot of city's parks, where there's not necessarily any specific "no detecting" rule. Yet ...... someone can/might still gripe. It could (like in your case) only because a lookie-lou griped. And NOT because you're breaking any rule. But that the LEO or park person needs to "satisfy miss lookie-lou. OR that some mis-informed park worker *thinks* you might be about to leave holes or marks.
So to avoid such nosy-parkers is
NOT to insinuate that: "
therefore you must be guilty of "sneaking around" or "breaking rules". It's kind of like nose-picking: not illegal, but .... you just pick more discreet times. So as not to offend others.
After 5pm is a better time