The lighthouse is on a US coast guard base, so you only get there with the tour. You will be told a little bit about the area and history and they also have a museum you can visit (included in admission price).
I would have liked to explore on my own, that's why I only give 2/5. The admission of $9 is also a bit high for seeing a light house, but is understandable because of the tours they have to do.
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