Hate to say it but I believe you are 2-3 week late for fall foliage. I am in Laurentians (north of Montreal) and the colors are now in the past up here so Vermont is history.
I guess you would need to be here to know,... and I am! , but fall colors here in Vt. are not done, In fact, they have just started! Those Canuks have an entirely different look on things ;-)
In the southern state, The Green River Covered bridge is a classic , There is A B&B right there. Do you want me to tell Joni (the owner) you are coming?
Bennington has it's Revolutionary memorial tower and the Grandma Moses Art Museum.
Rent a boat or just go for a ride on Harriman Reservoir off route9 Stop at Hog Back Mountain and take in the 100 mile view .
Route 100 is the "SKI HIGHWAY" with lots of ski areas offering scenic rides to the summit. Plus, they all have fall events. Last week it was "Wine and Harvest", Who knows what may come at other places in the weeks ahead. Check the schedules. I hear there are opportunities to golf all over.
If you were here this week, Swimming would be high on the "attractions" list, and that is never a "tourista" activity. Most of the fall fairs and their tractor pulls are come and gone. But check out Tunbridge just because.
A drive up Equinox Mountain ($10 toll) in Manchester is worth the look around, Manchester it's self is quite nice to stop and stay. And... There is some fellow that must have 100 old tractors out on display in a field just north of the town park. Just in case you like old tractors. ;-) I'm not sure how this goes today. The display may be there, I have not been over for months.
In the same Way, Ascutney Mountain on the East side is a worth while day trip. It's an absolute "MUST" if you were coming on two wheels. ;-)
Oh, There is so much. People come to Vermont to vacation. I feel fortunate to get to live here!