Below: At high tide water will actually come up into St Mark's Square. They have portable elevated sidewalks that they can bring out to help you get around.
Below: To remind you that this is a real city and not Disneyworld, the graffiti cretins will draw on a 500 year old bridge.
Below: They really do use canals instead of streets. It's not just for tourists. Here is a "truck" delivering bottled water and restaurant supplies.