I think this is a photo of two people riding jet skies. They were quite a long ways from me.
As soon as the sun sets, the sky becomes filled with fast flying birds. I think I caught one in this photo. They are so fast that I have a hard time photographing them. They have pointed wings. Maybe they are bats. It is fun to watch them. The setting sun is like a switch that turns them all on. Very exciting if you like that sort of thing. You have to be patient until that exact moment happens and it is over quickly.