I was there too. Not on the ‘official’ tours tho, so we had a much livelier few days in Pisa, incorporating, in no particular order, and by no particular persons : Being stopped for suspected drug running at the airport.  Having no hotel booked but getting a £10 a night room right opposite the Tower.  Smoking HUGE cigars with a German Professor from the local Uni.  Buying booze with cigarettes, as they had a cigarette strike over there and we had loads of duty frees and the locals wer