Im off to Lake Garda this week, i have organised a day trip to Milan and Verona ( we are actually staying overnight as going to the opera and getting last train back would have been too tight). Husband thinks we should continue to Venice and spend day there. Im torn as think its too short a time and will be really busy , he thinks its so close we should. Going with 15 yr old son. Thoughts? If we did go what are hi lights given only there for the day?