I've seen darker campgrounds but Big Meadows would be considered moderately dark, I believe. The East Coast is difficult to find darkness compared to the western states.
The best one
This is a great spot for this. There is some light pollution on the horizon, but it is pretty mild, especially for the East Coast. I've taken some great astrophotography from Big Meadows.
Trap Pond State Park in DE has fantastic star gazing. They have people from all over come to see the night sky
It is good in general. Do it. But if you go a bit further to GBT you will find best place in the area
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