If you haven't figured it out already, vaperretto is the best way of seeing Venice from the water. For reasons i couldn't understand the anti clockwise service is almost empty in the morning rush hour. We couldn't get anywhere near the clockwise service for the locals pushing the tourists out of the way!!Murano also foggy this morning . Sun's out now.
Indeed, the back "streets" have a good selection of eateries.
Hope you enjoy St Marks Square more than me - a total tourist trap when we were there in June, hopefully not so busy at this time of year.