You can check the best way to get from Naples to Positano right there: http://www.lifestylepositano.com/en/arrive_in_positano_from_naples over 7 years ago
Are there often ferries or is it any site with ferries-schedule from Naples to Ischia and from Sorrento to Capri?
You won't have problems: it's plenty of choice. You can check the timetable for the connections between Capri and Sorrento at: http://www.capri.net/en/ferry-schedule. At the same time, you can check the connections between Naples and Ischia at: http://www.traghettilines.it/en/ischia-island-ferries.aspx over 7 years ago
I'm from Napples. Naple is not more dangerous than any other big city. Stay away from Scampia, as there are nothing to see there. There are many stuffs to do in Naples, do don't miss it. about 8 years ago