I had the opportunity to visit SMKW back in October, when a few couples we hang with decided to go to Tenn. for a few days.
If your anything like me, you will need a full day to really visit the place. In addition to the multiple floors of retail items, they have a collection/museum of knives, edged tools, etc. that rival any collection/museum in the world. There is also a tool outlet next-door with some great items.
Either go with a set amount of money or plan on spending some cash, as it is hard to resist many of the great buys they only have in the store.
Pete