Later this month starts Foliage season when hords of folks from Mass. invade Vermont :-)

are you after the foliage change, then late Sept you need to head to the Northeast Kingdom. Lots of back roads there, little traffic, lots of moose, nice small towns. Are you camping or hoteling? Lodging fills fast at this time of year.

other ideas, stay off route 100, all the touist use it and drive crazy looking at trees. Ride the forest service roads, nice dirt, and little used. Great way to get around. Find any road with " Hill" or "Mountain" in it. Its sure to be a good ride.

riding for 7 days @50 miles is not going to get you around all of Vermont. i'd say pick an area (north or south) and do a little googling.