Visiting Pompeii or Herculaneum: Many visitors need to decide between these two very important sites. Pompeii is larger, but Herculaneum was better preserved because of the difficulty in excavation. The early visitors in Pompeii did quite a bit of damage and looting.

The HOHO bus has a new service to Pompeii  https://www.city-sightseeing.it/en/shuttle-bus-naples-pompeii/

Pompeii:

http://www.pompeiisites.org/index.jsp?idProgetto=2

http://www.mediterranean-cruise-ports-easy.com/visiting-pompeii.html

Herculaneum:

http://www.italyheaven.co.uk/campania/herculaneum.html