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Photo: Seaside-momochi.JPG: mmry0241 derivative work: Torsodog (talk), CC BY-SA 3.0 via Wikimedia Commons
A stretch of beach where visitors can enjoy a bit of swimming and sun. While the water isn't as clean as the waters further west and east in Fukuoka, you can still take a refreshing dip. There are a few lovely patio restaurants and bars which are an ideal location to watch the sun set. The area behind the Seahawk Hotel is good. It's less crowded during the summer.
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福岡タワー
The triangular reflective tower has magnificent views of the city and Hakata Bay from its 123-meter-high observation deck. (The whole tower is 234 m; the remaining 111 m is a television mast.) In Christmas and the Star Festival (Tanabata) on July 7, this tower is decorated. During the rest of the year the view is best at night time. This is an iconic symbol of Fukuoka. There is a restaurant which commands a ¥300 sitting fee in addition to the meal. The menu is limited and the food is mediocre at best.
福岡市科学館
Cotains Robosquare on its 5th floor. You can see and play with different kinds of robots and watch some of the engineers at work. Despite the imposing sounding name, Robosquare is one medium sized-room with a few robotics exhibits and some toy robots and is primarily aimed at children. Some English explanations are now available.
福岡市博物館
Permanent exhibition of city history and changing temporary exhibitions.
Winning the Japan Series seven times between 2011 and 2020, the Hawks was undoubtedly Japan's strongest team in the 2010s. Check out a baseball game at the Fukuoka PayPay Dome, which is about 15 min walking distance from Tōjinmachi subway station. Ticket prices vary by day, but you can get an outfield unreserved seat from ¥1,000.
愛宕神社
A hidden gem near the Muromi Subway Station, with a superb view of the city and Hakata Bay from a hilltop. You can also see many storks that fly by and nest in the area. Walk west from the subway station across the Muromi Bridge until you see the Atago torii gate with the stairs heading up. Alternatively there is a side road you can walk up if you don't like stairs.
西公園
A hilltop park with quiet walking trails, a shrine, an ocean and city view, and in springtime with over 3000 cherry trees is one of the finest places to see cherry blossoms in Kyushu.