I too will cast bbs off the beach at Seiku with great success. We don't have children but, if I did this would be the place to take them for learning how to play lotsa fish(4-10per hr.)when the silvers are running. Also a great place to teach the practice of catch and release as it is illegal to keep fish in the bay!
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Theres only two things that smell like fish... and one of em's fish.