What are three details that support the idea that the bay is "wild"?

From the text:

As for Jerry, once he saw that his mother had gained her beach, he began the steep descent to the bay. From where he was, high up among red-brown rocks, it was a scoop of moving bluish green fringed with white. As he went lower, he saw that spread among small promontories and inlets of rough, sharp rock, and the
crisping, lapping surface showed stains of purple and darker blue. Finally, as he ran sliding and scraping down the last few yards, he saw an edge of white surf and the shallow, luminous movement of water over white sand, and, beyond that, a solid, heavy blue.

He ran straight into the water and began swimming. He was a good swimmer. He went out fast over the gleaming sand, over a middle region where rocks lay like
discolored monsters under the surface, and then he was in the real sea — a warm sea where irregular cold currents from the deep water shocked his limbs.