There are many options to do in Fukuoka.
At first, I'd like you to enjoy what you can find only here...
Not well-known, so that not touristic but very nice local Onsens I recommend you to visit. After 1 hour+ drive and some Onsen instruction, you'll soon relax and love it!
And how about very nice lunch by the sea in a cozy restaurant?
or coffee in a cafe with a breath-taking view?
Please let me help you enjoy the city and relax in Fukuoka!
(So, please e-mail me to firstname.lastname@example.org