At Mouth of Hakata Bay
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Not to be confused with the Kyuka-mura Shikanoshima Beach on the outer tip of the peninsula which caters more toward families, this beach (and all its youth) is located to your right just as you are coming in to Shikanoshima from the highway along the sandbar. Note that between July 1st and August 31st, there is special netting set up offshore to filter out trash and, more importantly perhaps, jelly fish. You can certainly use the beach at other times—and many people do, especially surfers—but you run your own (incredibly minor) risk of being stung.