There was a ranger at the top when we visited.
You can go to top of light house, stairs are small and rounding. You get great exercise and view.
You can go to the top unguided. If you have any questions, it's possible the staff in the gift shop may be able to help and there's a great video as well.
You can go to the top. I don't know if there are guided tours, but there's a good deal of info and a short video.
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