If you go, do plan your visit beforehand.
Important starting point is to check the tide schedule. You can do this via their website (japanese only) or with the tourist information office.
We took the bus from Naruto JR Station. The buses to Naruto park don't go that frequent, so check this as well.
It is at the end station of the bus line, so you can't miss.
The observatory is a 500 meter walkway under a bridge (Naruto-ohashi) with good viewing points and perspex windows in the floor. The whirlpools are impressive.
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