We will be on a Greek cruise from Oct 2 to Oct 12. When it docks in Naples we would like a private day tour of Sorrento, Positano and Pompeii. Any recommendations. Some responses I've received are much more expensive than on the other islands. Thanks,
Try: ToursofPompeii.com
There are hundreds of private tour guides in the Naples/Pompeii area that also cover the Amalfi Coast. You can see the ratings in TripAdvisor.com under Thiings to Do in Naples. It's not a place that has so many tour buses available.
Shore excursions in Italy are more expensive than the Greek Islands. I just returned from a 12 night Med cruise and recommend you look on cruisecritic for your rollcall for suggestions from fellow cruisers.