The view from the Inland Marsh Overlook is quite nice and a great place to take a quick picture, but sadly it has become somewhat of a meeting place for men (often in groups) forcefully trying to ascertain sexual favors, usually from other men and boys, or even engaging in public sex acts. Law enforcement really needs to do a better job in preventing this, but until the problem is taken care of, if you see another car parked in the small lot at the overlook I recommend not stopping.
Since many people fail to heed the ice shelf warning I'll mention it again, this time with graphic photographic evidence. See: a quarter-inch of frozen water and sand is all that separates a dummy from hypothermia and possible death. Stay off the ice shelf, it's hollow!
The ice shelf looks awful pretty; other-worldly I would say, but don't even think about walking on it. Through the actions of the wind and water, most of the shelf is actually hollow. Plunging through into the icy waters is a very real possibility and getting out is difficult even if you have people helping you. I've seen it happen! Stay off the ice shelf!