Indiana Dunes Mystery Location

Maybe someone can help me remember a location I visited 30 years ago. Yes, it was 30 years ago when my then girlfriend and her roommate had me help navigate them through Chicago to a secluded place near and/or at the dunes. Other than these girls getting completely naked (and then getting me naked) when we got there, the only thing I remember was getting off an expressway, taking a few turns on county roads, and then turning down a stone and woodchip path that took us to a grassy clearing surrounded by trees. It was about 100 yards wide and about 100 yards to the water with a small berm about halfway. The dozen or so people who showed up during the day to this location all went completely naked and freely walked to and from the water with no concern of law enforcement. Anyone have any idea where this place was and if still exists? It's a longshot but figured I'd ask. Thanks.

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