If you are taking muchxs' advice and going to Taughannock Falls (I would call it a significant side trip) then you need to stop in at Ithaca Guitar Works and Rumble Seat Music, both just off the commons in Ithaca. Lunch at Moosewood. Photo op at the base of Buttermilk Falls too.
Ithaca is gorges.
It ain't exactly a straight shot up I-93, either. Kinda like "They had to find each other so they set out in opposite directions." Still, it avoids all the I-90 tolls. Pay a buck at Hooksett in New Hampshire and you're all set...
Or... Head up I-95 and get off at Hampton Beach. Play a couple games of Skee Ball and ask 'em about their Whack-a-Mole. Haven't seen a Whack-a-Mole all the way up to the Quebec Riviera otherwise known as Old Orchard Beach. I suspect all the moles have been whacked into submission. Maybe they still have one at Fun Spot in Laconia?
Take a short trip up Route 1 on the way back to I-95 and grab a plate at Al's Seafood. It's right next to the Home Depot...
It takes a little fiddlin' to get back on I-95, if you have a GPS it will take you through Portsmouth and back on south of Kittery.
If you like to buy stuff stop at the Tanger Outlets in Kittery. Not part of the outlets, the Kittery Trading Post has a massive inventory of guns. Also not part of the outlets, Yummies up at the other end of the street has every kind of candy known to Man.
Buy stuff, get back on I-95. Stop at Old Orchard Beach if you want to see the longest continuous stretch of beach in Maine.
Continue north on I-95. Navigate to The Great Lost Bear in Portland. Find youself a seat at the back of the bar, order the hot wings.
The street that runs in front of The Great Lost Bear becomes Route 302. That will take you past Sebago, Long Pond, Highland Lake and eventually into the White Mountains in New Hampshire.
People pay good money to see this stuff.
If you missed Al's there's a little hole in the wall place at the junction of 302 and 117 in Bridgeton.
I could tip you off on some micro attractions along the way but there's plenty to see if I don't.
302 joins up with I-93 north of the notch. You might want to backtrack a couple miles, see the notch then do the trip to Vermont.
Buy some cheddar while you're there.
There are dozens of "touristy" routes across Vermont. The quick ways are Route 2 to the north, Route 4 or I-89 towards the middle of the state.