Arenzano's main sights cluster in and around the town centre. The Santuario di Gesù Bambino di Praga is a busy pilgrimage church with an impressive permanent nativity scene; the park of Villa Negrotto Cambiaso is a free, shaded escape from the heat. The Lungomare is the place for an evening walk, and Punta San Martino the best spot for sunset.
For a more active day, the Parco del Beigua starts right behind town and climbs into a serious mountain landscape — a UNESCO Geopark with hiking trails for all levels.