Seneca Falls is an interesting stop. The first women's right convention was held there, and a museum is within walking distance dedicated to the cause. There are other museums in downtown as well, including one dedicated to the movie "It's a Wonderful Life". Seneca Falls was once a thriving industrial town that produced water pumps, knit goods, etc.
Although there are many nice days in the fall, the weather seems to start deteriorating after Labor Day, more gloomy and rainy days.
I speak as a former New Yorker who lived nearby and now live in Florida.
BTW there are many wineries in the area, it may be worthwhile to rent a vehicle and explore the beautiful countryside.