Much has been written deploring the number of tourists in Venice, especially those now arriving on cruise ships. But I don't recall seeing this quantified. So I looked at the list of cruise ships that will be in Venice on the day we expect to arrive there, which is Sunday, 8 June.
Keep in mind that the total population of Venice these days is said to be about 55,000. The number of cruise passengers arriving in Venice that day, plus the number cruising out of Venice that day (assuming each ship is at maximum capacity), is -- 13,009. Note that this does not count cruise passengers still in town who arrived a day or two earlier, or those already in town whose ships will depart a day or two later, not to mention those who arrived by air, by rail, by car, or on bus tours (day-trippers or otherwise).
No wonder the Venetians are said to prefer even the pigeons to the tourists.