Buon giorno tutti;

I've been given a 1 week + solo pass prior to the birth of our little one in April & think I'm going to Venice next month. I was shooting hand held last time I went so this never came up. What is the general rule for putting down a tripod on the ancient streets of Italy ? Any tips, experiences, etc would be appreciated. That last thing I need is a $500 euro fine for not having an 'easily' secured permit.