The best stretch of the Mohawk Trail runs from North Adams to Greenfield. This stretch of road is a great day trip or starting point for touring New England.
"The ride up 7 is always entertaining; it's a wide, smooth and reasonably twisty road with just enough roadside attractions and moderately priced eateries to make a quick leg-stretching stop worthwhile. The town of Kent, Connecticut, is particularly nice. "
From Motorcycle Cruiser magazine.
You should also try the section of the Mohawk trail the goes west from North Adams/Williamstown to Rt 22 in New York.