My Watermark is the Toronto Harbour of Lake Ontario.
When I was 10 or 11, my rich friend had a yacht on the harbour. The adults were doing their thing. We got on the little dingy, a little inflatable zodiac, and off we went. We got to the island and beached it. We stepped out and everyone was naked because it was Hanlan's Point.
We went to Hanlan's Point without realizing it.