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The cave is 68 degrees year round. The park offers guided tours that last approximately 1 hour and 25 minutes (a 1 1/4-mile round trip). For your safety and comfort, low-heeled shoes with rubber soles are recommended. Open every day except Christmas Eve and Christmas Day. Visitor Center opens at 9 a.m. daily. The first tour leaves between 10 and 11 am (call ahead). Tours are conveniently scheduled throughout the day.