Doug Salomon
They also sell infused syrups (like smokey spiced maple syrup) but don't offer tasting of those.
The Maple Leaf Place plaza, along the Niagara River Parkway, has a new shop which still maple syrup and other goodies.
They offer maple syrup tasting which is a nice touch. They give you a "flight" of shot glasses with golden, amber and dark syrups. It's cool to taste these side-by-side and really appreciate the differences.