After much discussion with Mrs Taiwaned, she had decided we are going to Fukuoka for our anniversary. Forget Nagano or Hokkaido (see previous thread)

I really don't mind, I love Yatai and I like the Hanshin Tigers who will be visiting the Fukuoka Hawks when we plan to visit Fukuoka.
However, I would like some input is an onsen where we can book a family room. Where you can either have an onsen pool IN your room (best option) or you can book the onsen for just yourself.
Are there any recommendations?