I am taking a Western Mediterranean cruise in September 2008 with Norwegian Gem (NCL) from Barcelona, Spain. Can anyone tell me if booking an excursion through my cruise liner (Norwegian Gem) is worth it? For safe purposes, I already booked an excursion for Rome and Livorno, Italy and Nice, France. I am going at it alone for Barcelona, Spain because I am staying there for two days after my cruise. However, I am worried about Naples/Pompeii, Italy and Valletta, Malta. Would anyone recommend me booking through NCL for those excursion or could I did those on my own? Also, please give me details and tips on what to expect and how to travel to those areas. Thank you for your time.