We flew into Naples and rented a car. A few nights in Naples is worth it for the food and shopping alone. Naples is not a pretty city, but my goodness, the food is amazing! You have to get a Caprese Salad while you are in this area. You can catch a city bus if you are near the airport really cheap. I would be scared to drive downtown Naples, but you'll want a car to do the drive south.
The Amalfi Coast is beautiful. Crazy driving and highly stressful as the cliff is on one side and oncoming buses are on the other. Chill out and concentrate and have someone there to take pics of all the things you're missing cause you're driving! Shots like this..
We stayed along the way in Sorrento. Visit the lemon groves and taste Lemoncello everywhere! We went to the beach and stayed right downtown. There is a bus that goes from Naples to Sorrento too, but you miss all the sights along the way.
We stopped here in Positano for a walk, some shopping, and some picture taking. There's no parking here, you have to find a spot on the top of the cliff and walk down stairs to the town of Positano.