thistlintom.... The lines at the Doges Palace and St. Marks can be ridiculously long. I can give you the name of our guide. If you hire her to take you to these places, she can get you in without waiting in line. Saves hours. She can arrange a private boat to Murano. You can hire her for a half day, full day, or whatever you like. It was worth the look on the faces of the hundreds of people in line when we walked right up to St. Marks and got through. (Who are those folks?)
If you are interested, you can email me at email@example.com I will look at my email tomorrow when I am in the office, and can email you her contact info.
As in most of Europe. Go online and buy early bird tickets. They will have you on a schedule, and all you do is walk to the front of the line, and no waiting.