At least over water you can see where the "persons" and "vessels" are, and in my experience, you get a friendly wave - at least they looked friendly to me!
Persons and vessels, sure, but I was told that the whales were another problem - the requirement not to land within half a mile of a whale is all very well, but they quickly come along to play round your aircraft so how can you then prove that you didn't land too near to them?