Just a thought on the Pompeii tour, I would urge you to take a look into Ercalona/Herculaneum. It is a smaller site but unbelievably well preserved & still being excavated today.
2 of the many reasons to look here (apart from it's far less crowded) is that it is already in decay having only been discovered again in the 1980's or 1990's, so may not be around for your next visit, and there is a museum there which actually houses most of the artifacts from the Pompeii site. But check if that museum is now open to the public.
Please take a look at Herculaneum travel guide - Wikitravel
and Herculaneum - Wikipedia, the free encyclopedia
, I think you will find it food for thought.
Alan & Katrina
Last Cruise: Queen Victoria November 2014
Next: Minerva April 2015
Golden, Grand(2), Caribbean, Sea(4+1 aborted)
Adonia(4+2), Arcadia, Artemis(2), Aurora(5), Azura(2), Oceana(3), Oriana(11), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(6), QE, Caronia(2), Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam, Aza.Journey