Itinerary was very full of wonderful activities and sights to see! You're up and going early every day but it's well worth it to get going to be first in line ahead of the many other tour groups that follow.
Wonderful trip! I strongly recommend several of the Optional Experiences to make the most of your time, including the sunset boat trip in Paris (you see the Eiffel Tower aglow!), walking tour of Hidden Venice, and walking tour of the Colosseum in Rome.
Be prepared to walk a lot (I hit 10-14k steps most days!) Be prepared for early mornings.