Not a blessed thing!
Free till you go buy stuff in the gift shop and most of the light houses have a place for donations
Feel free to give something if you want to...kindle people use to guide and help. In our visit there was a man who told us many interesting things. At the top of lighthouse(short climb)...
Phil is right, it's free. Just don't visit the lighthouse in the Summer because it's too hot to go up in there.
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