There are no real beaches in Genoa, but its location on the Mediterranean is between two major beach regions of the Italian Riviera.

 You'll find a small beach at Boccadasse, an old and picturesque fishing village that's now a neighborhood of Genoa. 

You can stroll along the seafront promenade or take a local bus to this little seaside enclave of pastel buildings around a shingle beach. 

There are plenty of restaurants from whose terraces you can enjoy the view, but they're crowded on weekends when the weather is good.