Be wary of gladiators outside the colosseum. They don't take photos for free and can be quite agressive about their payment. Also don't be fooled into taking an unlicensed guided tour of the Colosseum either....
Itter was one of the nicest town's I've ever been in, absolutely gorgeous. It's a sleepy town, but on Contiki you bring your own nightlife. This was one stop I wont forget.
This is a FANTASTIC tour for a city person. The shopping, dining, nightlife, and cultural opportunities are limitless as each city seems to outshine the last.