Niagara Falls is a short drive from Buffalo and you can visit either the US or Canadian side. The Canadian side is better, in our opinion, so make sure to bring your passport!
There is a reason Buffalo is known for wings. Be sure to try some while you're here - we recommend Bar-bill, Nine-Eleven Tavern, and Gabriel's Gate. But you really can't go wrong!
Enjoy a nice walk alongside the river. There are restaurants, kayak rentals, and the naval park.
Buffalo is known for its architecture. Check out the Frank Lloyd Wright houses in the area, like the Darwin Martin house, and the art deco style buildings downtown. There is also a great art museum, the AKG Museum, next to Delaware park.