For those who want to go on a date or see the nice seaside view of Fukuoka, the Nishitetsu/Marinoa company offers a series of 90 minute cruises around Hakata Bay. There are a variety of prices to match your budget, lunch cruises starting from ￥3000 and dinner ones starting from ￥5000 per person. These cruises are run nearly every day in the year and you can reserve them at the Nishitetsu Grand Hotel (a 3 minute walk from GenkiJACS.
I went on a dinner cruise for Valentine`s Day. There are lots of lights in the city at night so you can pinpoint the major landmarks along the coast. Highly recommended!