I’m from the area (Schenectady). Montreal is nice, but the length of the drive eats into your time for a day trip. If you’re just there for a few hours, stop and wander in the Old City (especially on weekends, when there are entertainers) and eat. It doesn’t matter where – you can’t toss a rock in Montreal without hitting a great restaurant. And the exchange rate is fantastic; it’s like getting 1/3 off everything. (And if you buy enough, you get a refund of your tax, too!)
Other day trips depend on your interests. Some include:
Howe’s Cavern and the Indian Museum nearby, if you’re so inclined.
Lake Placid. Nice town even in the summer. Go to the Mt. Van Hoevenberg bobsled/luge runs; you can take a bobsled (even in summer) or just walk down them.
Cooperstown. Baseball Hall of Fame, of course, as well as their Farmer’s Museum.
Sturbridge, MA – Old Sturbridge Village is a great reconstruction of an 1830s community. There are events during the year that correspond to life at those times. It’s getting near sheep shearing time, BTW.
Bennington, VT – You can see the battle monument (the battlefield is actually in Hoosic, NY) and visit the shops and the Grandma Moses exhibit at the Bennington Museum. Be sure to go to the Chocolate Barn on Route 7 north of the city.
Stockbridge, MA – Pretty town made famous by Norman Rockwell. There’s the Rockwell Museum (his stuff looks better full-size) and the Red Lion Inn.
Albany – If you haven’t visited the State Museum, give it a try. Also check for the various festivals at the Empire State Plaza.
Saratoga/Stillwater – Take a look at the battlefield if you have any interest in history. This was a key battle for American independence.
Saratoga Springs – Nice shopping downtown, plus Congress Park. Try the water at your own risk (salty and sour). In the State Park, though one of the springs is great for fixing sinus problems. The State Park is free until Memorial Day. There’s also the Museum of Dance.
Schenectady – the Schenectady Museum is celebrating astronomy week. I’ll be on a panel tomorrow at 2:30; come by and say hello.