No, I've never been to one. That's not really a thing here but there is one clothing optional beach that I know of. Actually, "beach" because it's like a tiny park on the lake (no ocean or sea here, so we don't have beaches).
I've never been but my brother has been to an actual nude beach and he says he probably won't go back. He told me it's mostly old people and people you don't want to see naked.