Wrightsville in the East Montpelier/Middlesex area is great- I rarely see motor boats and when I do they are always down by the damn/boat launch and don’t go fast. If you head away from the damn and up the river there is some lovely paddling and when the water is high enough you can get almost to the falls. Blueberry lake in Warren is all non-motorized and is small. I also really like Nichols Pond, the access is pretty remote and a little tricky to put in though.