I'm a local the Seneca Niagara Casino and Hotel at http://senecaniagaracasino.com Also Comfort Inn - The Pointe, Crowne Plaza a good place, Days Inn at the Falls, Econo Lodge, Howard Johnson Hotel everyone of these i've stayed at and thier all wonderful but the Seneca Niagara tops the list.
Hyatt regency is nice expensive though you can read reviews see maps and pictures on this site http://redhotescapes.com/
go to vaca packages u.s. and do hotel then you will get all the info then go to trip advisor and read there reviews also