Eco bike touring from Montreal, Canada to Cape Cod, USA

Hello,
I am a newbie here. I will be biking from Montreal to Cape Cod during the month of June and am looking for some tips on roads to take and places to visit. My goal is to visit eco-initiatives, but I am not sure which roads would be best to take...
I have an idea of the itinerary but no set trajectory yet.

I will go from Montreal, to Plattsburgh NY, across Lake Champlain to Burlington VT, to Rutland VT, to New Lebanon NY, to Sprinfield MA, to Manchester CT, to the Cape!

Which route do you recommend? Which one do you think I really should not take?

Thanks for your help =)

Véro à Vélo