What is it or why is it some of us find being on the water, swimming in it, or just being near it so appealing?

Why should we find that boating, swimming or just being near water makes, at least some of us, feel serene and tranquil? When I’m out in a boat, I don’t have a care in the world. Some people are terrified of the thought, and frankly, that’s the wiser feeling if you think it through. Anything goes wrong you can easily drown. Land can’t kill you as easily as water, but we spend millions of dollars to put ourselves at risk. Why is that?