I've been to Naples a couple times (including recently). I highly recommend a tour that takes you to Pompeii and the Amalfi Coastal Drive. They are fabulous and made for one of the best days of my life. Pompeii is a GIGANTIC, highly organized city and it is amazing. See the villas, corpses, frescoes, brothel and you'll learn so much. The Amalfi Coastal Drive buses you right along the edge of a cliff reaching up to an elevation of 4,000 ft. where you'll pass forts that used to watch out for pirates, lemon groves, cities with amazing bays, and lovely architecture.
I see that Splendor does this cruise through October also. Is October to cool/rainy for this itinerary? We're trying to work it out for September, but we're running into a lot of conflicts. Thanks in advance.