as has been said I think the best way is to nip it before it starts and that is before quiet hours are in place.
A patrol of the park 15minutes before to see where the action is.
last CG I was at quiet hours started at 10PM. It was relatively quiet except for a site across the lane with 2 tents on it with 2 families. They were not there most of the evening but at just before 10 they started up what looked like a "bean bag tourney". They set up portable lights and started tossing bean bags. I got out of bed and immediately went to the office where the owners were closing up. I explained what was starting and he came down to check it out.
In this case maybe one could have closed down the office while the other drove around and they would have seen the same thing I did.