Leave the motorway A-3 Napoli-Salerno at Castellammare di Stabia toll-gate (Km 22), follow directions to Sorrento-Penisola Sorrentina. Keep on along the ring road in order to avoid the busy centre of Castellammare.
You will go under four tunnels, then after few kilometres you will be in Meta. At this point you can choose whether to go through Piano, Sant’Agnello and Sorrento and then take Via Nastro Verde and reach Sant’Agata, or to take the road to Amalfi and at Colli di Teresinella turn right and follow directions to Sant’Agata.