Originally Posted by Yashodara

The best way to go from Rome to Sorrento is actually rent a car. It's a nice journey and you can organize yourself as you want (important with children along...). Check with Herz or Europcar websites, best fares are to be found online, you can probably pick up the car in Rome and drop it off in Sorrento.

Best wishes for your trip and just ask me if you need more advice...