Went there in the summer with the family so I didn't get to do much beer exploring as I was in most of the tourist traps . Went to Niagara Falls brewing company which is on the Canadian side. Nice enough place as its new but all their beers I had tasted the same. Very middle of the road and generic.
Griffon Gastro pub on Military Road just off I-190 , Niagara Falls. Good tap selection and great food
If you want a bottle shop and don't mind driving... http://www.beeradvocate.com/beer/profile/1081/?view=ratings Best beer selection in WNY (IMO)