We traveled from Rome to Naples, then to Sorrento by train. Very easy. We travelled to Pompeii on the local train, also easy. For traveling along the amalfi coast, we took the bus in November. There were not a lot of tourists on the bus at that time of the year, I heard it gets pretty packed during the summer. Coming back, the bus either left without a lot of people or he decided to wait another hour, not sure. Their timetables were not reliable. With 5 people, it may be better to hire a guide for that, I looked into it. I think it was $300. I don't recommend driving it. A bad thunderstorm occurred on the way back to Sorrento, I was so happy to be sitting in the bus & not driving those roads.
Mary