Spaccanapoli & the centro storico
A city you visit on foot, from Napoli Centrale outward — and the easy way to get there from Sant'Agata is the train from Caserta or Maddaloni-Marcianise. Fifteen minutes regional, ten minutes high-speed; the historic centre's spine, Spaccanapoli, starts more or less at the station and runs straight to the sea.
Plan for crowds, motorbikes, and stroller-hostile cobbles — the carrier is the right choice for an old-town day. Avoid driving in: the city's traffic is its own weather system.