There was an oily looking foam and the water pooling close to the beach had an oily looking tint to it. And once the waves washed onto the beach it left an oily looking residue on the beach. I have some photos but they don't really tell the story since they don't convey the oily looking nature of what I saw.
https://2img.net/r/ihimg/f/18/beach1n.jpg/
https://2img.net/r/ihimg/f/19/beach2xc.jpg/
https://2img.net/r/ihimizer/img835/5512/beach3c.jpg
https://2img.net/r/ihimg/f/18/beach1n.jpg/
https://2img.net/r/ihimg/f/19/beach2xc.jpg/
https://2img.net/r/ihimizer/img835/5512/beach3c.jpg