Venice is amazing. I like your St Mark's Square night shots. When I was there, the place was more crowded and more festive with people playing music. Tourists were everywhere, some walking around while some of them were sitting and enjoying a glass of wine. It's quite romantic at night but I am afraid it's just too crowded during the day -- too many tourists! Besides the Grand Canal, there are many other places to see and visit in Venice. I recommend to take a trip to the nearby Murano Island as the glass factories there are quite interesting. I love Venice. Go there when the weather is nice.