Bingley
Veteran
You've received some great suggestions. I hesitate to throw anything further your way, but if you want to get off the beaten path for the inland part of your trip, the small towns along the border between Vermont and New York are photogenic in a rough-hewn (non-touristy) sort of way and the countryside is as beautiful as anywhere in New England. I'm thinking of places like Hoosick Falls (Grandma Moses country), Eagle Bridge, and Cambridge, NY. I lived in that neck of the woods (in and around Bennington, Vt) for ten years, and the entire area is worth exploring. If you draw a line between the Hudson and Connecticut Rivers through Rutland, Vt on the north end and Great Barrington, MA on the south, the area w/in that rectangle is extraordinarily beautiful and interesting.
On the coast, if you're going up through Maine, a visit to some of the islands would be a treat, e.g. Vinalhaven.
On the coast, if you're going up through Maine, a visit to some of the islands would be a treat, e.g. Vinalhaven.