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They have educational underground tours. They also have a minigolf course. Their hours vary with time of year so check out their hours page. They are closed all together from Dec-Feb.
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Besides the beautiful cavern, you get to actually go mining for gold (only open during the summer). They are open 9AM-6PM from Memorial day to Labor day and 9AM-4PM the rest of the year.
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The temperature is a constant 52 degrees, so you'll need a sweater or jacket. Bring your camera too! There's a lot to discover in this magical land of crystal formations where the Lost River flows.