I will be arriving in Venice on 12/26. I have to decide whether to leave for London on the 29th or the 30th. I have looked at Rick's itinerary for Venice:
https://www.ricksteves.com/europe/italy/venice-itinerary
If I wanted to leave on the 29th, and follow his itinerary for day 1 and day 3, does that make sense? How cool is the stuff on day 2?