I would suggest taking the tour here at Patsy's Candy Shop (its free so why not). A suggestion would be to call ahead, as we had alot of people in front of us on a Tuesday morning. Could have been a fluke, but we had to split people up and have 2 tours instead of one. They give out free samples and let you watch while they make toffee or mint chocolate.
Another suggestion would be to go in smaller groups that way you can hear what is being said about the different machines and the way the make the candy.
Overall it was a nice tour.
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