I have been to Naruto many times, and have yet to see the giant whirlpools featured in advertisements. However, the tide formations are very fascinating, making swirls and ripples that are rather hypnotic to watch. It is fun to go out in a boat to see them, though there are wonderful views from the bridge and viewpoint as well. It is a good place to learn about tidal action and understand some of the dynamics of the Inland Sea. It is possible to see the whirlpools without paying any entry fees, though if you visit, it is worth checking out the viewing platforms under the bridge, which charge an admission.