Just had a situation where I was on the Mill Pond and had a couple ask me where the springs on the pond were located. We started talking without me giving out any information. I asked them what they were planning on doing. They were just snorkeling and I confirmed this by looking in there canoe. I then vaguely told them the location of the springs as I still wasn't sure whether they might plan to return at some point with tanks and gear. Although from talking to them I'm pretty sure they weren't scuba trained at all.