Going to Naples from Sorrento is much easier than going to Amalfi and Positano. The easiest means of transportation is to use rail and sea.
Starting with Naples on the Circumvesuviana train to Sorrento, you can easily get off to a wonderful journey along the coastal strip. The journey between Naples and Sorrento depends on the train you have chosen as it stops at several other coastal towns, especially Herculaneum and Pompeii.
The trains heading from Naples to Sorrento depart from the train station Napoli Centrale in Piazza Garibaldi in Naples, the main station, every half hour from 6 am to 11 pm. These trips, which are valid for every day, last approximately 45 minutes to 1,5 hours.
If you want to go quickly, trains with “direttisimo” arrive faster than those with “diretto” because they have less stops along the way. The trains reserved for Circumvesuviana depart from the lower floor of the Naples Centrale train station.
Tickets can be bought from vending machines if you want to, and the price for a one way ticket is 4 €. If you are going on a day trip, get a daily pass and you can get on a train at any time you want and return to Naples by 11 o’clock at night. Daily pass for trains between Naples and Sorrento is 7 €. Buying daily pass train tickets would save you 1€ compared to buying two different one way tickets. If you have the ArteCard Campania card, the train fees are included in the price of that card.
The cheapest way to go from Naples to Sorrento is trains, but do not forget to keep an eye on your goods when traveling with these trains. I have heard not so good stories on the trains between Naples and Sorrento. I would recommend using ferry between Naples and Sorrento as it is much safer.