I would definitely make a reservation, especially during the summer if you go. It’s an awesome tour and an amazing place.
And it's cool. It is a bit of a destination site but it's a good memory. Do it.
You can call or go to https://www.tazachocolate.com/pages/take-a-tour for a reservation.
You'd probably want to call ahead and reserve spots, not required but their tours do reach capacity
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