Just a quick tip garnered from my first trip to Venice a couple of months back.
Set aside a morning. Don some smart gear, arrive at Harry’s Bar as it opens, (I think 11 am, but check), sit sipping overpriced but tasty Bellinis as the tourists in shorts / kagoules, whatever, are turned away.
Google ‘Harry’s Bar’ if you need to know more. SWMBO will enjoy it more than shopping – trust me.
Moggy