I loved Sorrento, but would give Naples a miss. I would recommend Versuvias as well. Not so sure about Capri, I found it very expensive. Visiting Pompei and Herculaneum is worth it too. Read up on why the Volcanic eruption created two distinct outcomes
If you have access to a car (or can arrange a trip) then I would also recommend travelling further South down the Amalfi coast. In particular google the following:
Positano, Amalfi, Ravello.
I love Italy.
Exactly, all of this. Also think Italy is great.