you not interested in southern kyushu? the nicer places should be there. fkk and nagasaki are not exactly exciting places. 5 nights is slightly long imo. i did 4 i think and i found it dull.
you can consider taking a 1hr shinkansen to hiroshima if you don't mind going out of kyushu. i kinda like chugoku better, miyajima and iwakuni are nice.
BlueBulb wrote:
which places u use JR Pass or dont have at all?
wa seh... u stay so many places 
yes, i am planning 10 - 11 nights.
any chance i can glance at your itinerary?
day 1 - 3 Kumamoto (3 Nights)
Day 4 - 5 Yufu (2 nights)
Day 6 - 10 Fukouka (5 Nights ? or split with Nagasaki?)
so what do u think?