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Tom Haraden's self-described "magical" career in the National Park Service started in 1972 as a volunteer in Yellowstone National Park in Wyoming. Since then, he's worked in nine US national parks. "I loved every minute," Haraden said of his 37-year career. Haraden said he's spoken to thousands of visitors during this time, and he's also seen people make plenty of mistakes. His general advice to avoid them: "be smart." "The park service's philosophy on safety is that your safety is your responsibility," he said. Here are some of the most common mistakes Haraden said he saw in his four-decade career and how to avoid them.