The time to enjoy a European tour is about three weeks after you unpack. Though there are some disagreeable things in Venice there is nothing so disagreeable as the visitors. To be a tourist is to escape accountability. Errors and failings don't cling to you the way they do back home. You're able to drift across continents and languages, suspending the operation of sound thought.
Tourism is the march of stupidity.
You're expected to be stupid. The entire mechanism of the host country is geared to travelers acting stupidly. You walk around dazed, squinting into fold-out maps. You don't know how to talk to people, how to get anywhere, what the money means, what time it is, what to eat or how to eat it. Being stupid is the pattern, the level and the norm.