So glad you had a great time! Looks like you saw some good stuff and took great pictures too! I do not regret my trip overseas and recommend it to everyone. SO cool seeing the days of old!
I went to venice a couple years ago. I thought the square and one of the main streets (have lights over head) were nice but the rest of the city was covered in graffiti, trash and puke. So stick to the "better" areas. Get a book on some of the areas you want to go see and read up in...