[fxtentacle]

The lake was on private property owned by the parents of one of the participants. But there's an "open to the public" hiking trail at the border of their property. So legally, I'd consider this similar to looking over the fence into your neighbor's garden.

I'd estimate that for most participants, the point of being nude was to feel free. I mean this was students drinking, swimming, and playing beach games for relaxation, not some political rally.