If I were a mermaid.
If I were a mermaid, I wouldn't be around a lot of other humans. I would stay away from them as much as I could, because it's hard to trust them. I would swim with some of the water animals and other mermaids, go deep down into a cave that no human can't ever get to it, where us mermaids have hidden all the treasure at. I would go to the surface and lay on the rocks to get a sunbath. In the morning I'll go up and watch the sun rise and at night I'll go up again to watch the sunset. Of course I'll save humans that can't swim and far from land, but other than that I won't be around.