For a view of the bay, check out the Bayside Place Hakata Pier:a marine terminal for the regular service ferries for Tsushima Island and Hakata Bay cruise boats. The terminal building has an 8-m-tall aquarium, with 6,000 fish.
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It has an observatory 70 m above the ground, allowing for a great view of the port and the streets of Fukuoka.
Hakata-za
An experience worth checking out. Check times and prices at the Hakata-za near Nakasu. If you don't want to stay for the whole show, or don't have so much money to spend, you can watch part of a show for about ¥800; see here for details. Half price student/young (~25) adult tickets may be available day of performance to be released 20 minutes prior to the show; see here for details.
This gallery hosts temporary exhibitions from Kyushu and all around Asia. It has a good shop.
This area is next to Tenjin and is Fukuoka's red-light district, with over 3500 restaurants, as well as ramen stalls (yatai), shopping, pubs, hostess bars, rooftop beer gardens in summer, one surviving movie theater, and sex trade. The neon lights on the Naka River are famous with over 60,000 visitors a day, and it has the busiest street in Kyushu.
The ACROS building has a terraced roof that merges with the park and contains some 35,000 plants representing 76 species. It is 809 steps to the top. Just east of ACROS is the former Prefectural Guest House, featuring turn-of-the-century architecture.
Japan's first Zen temple.