Pocket beaches in rocky areas. Large waves break onshore, which makes for good surfing. Swimming is challenging to dangerous. Rip currents can pose a threat. Fine white sand, very coarse sand, or even cobbles.
Some beaches are sand on top of hard rock.
Hypothermia is a major concern for any swimmer. A comprehensive database for 2000 recreation sites for parks, forests and public resources times since August 9, 1997.