The coastal landmark named Caprica Beach has never been seen, but is mentioned by Saul Tigh in the episode "Bastille Day". Tigh sees photos of frozen water deposits on a moon and promptly says, "Not exactly Caprica Beach down there, is it?"
The beach's specific location on Caprica is unknown. While Caprica City is shown to have a waterfront (Miniseries, opening credits), the portion seen appears to have a seawall rather than a beach.
Caprica Beach was presumably a picturesque or pleasant locale, since Tigh describes the barren moon as its antithesis.