To visit Venice, advice from seasoned travellers: Stay in the suburbs (20 km radius). Take public transport to Venice itself. Continue through Venice on foot over bridges to St Mark's Square. Take a boat ride along the entire grand canal. Venice is an extraordinary city, but alas not a magical one).
Venice or mass psychosis, there's no other word for it!
If you have a tour of Europe, it's certainly worth coming here, but just for one day, no more. You definitely shouldn't fly here for a week of "relaxation".