We also used Italytours.eu. It was an excursion from Naples to Pompeii and the Amalfi coast. We also used Driverinrome.com for a tour from Livorno which was a wine tour in Tuscany and surrounding countryside. Both tours were excellent, and I would not hesitate to use either tour company again. We did end up sharing some tours with other cruisers who posted on the roll call.
Enjoy your cruise!