You will enjoy the Missouri Star Quilt company. I went wild over their layer cakes. I suggest studying their website before you go in case you want any of the specialty rulers that they have designed. Also, when I was there, they had free patterns spread throughout the store - be sure to look for those. And don't forget to ask about their daily deal. It's valid for their store as well as their online store.
I'm sure others will join in to recommend other stores. I don't live in the area - we were passing through by way of Hamilton - DH planned it as a side trip for me.