Not a well known park, except for the locals I'm sure, as its only a stone's throw from Port Lincoln. Its just that Pt Lincoln is a long way from anywhere!
Well worth visiting if you're in the area. https://en.wikipedia.org/wiki/Lincoln_National_Park
Are those some of the stones that were thrown? The colors and the texture of the dried vegetation on the beach along with the patterned clouds join together to make a lovely scene.