Northern Kyushu Travel

Hi!

Is this itinerary efficient/feasible or should I include or remove a place to make a particular day worth it?

Day 0: arrival in fukuoka (7:15pm)
(We are staying in Fukuoka for 6 nights and have bought a 5-day Northern Kyushu JR pass)

Day 1: navigate fukuoka on foot covering ohori park, japanese garden, fukuoka castle ruins, gokoku shrine, uminona kamichi seaside park & canal city

Day 2: Huis Ten Bosch

Day 3: Kumamoto, Kumamoto Castle, Suizenji garden & Mt. Aso

Day 4: Nagasaki, glover garden & seaside park, dutch slope walk, chinatown, dejima dutch merchants island, nagasaki atomic bomb museum, peace park

Day 5: Yufuin via Yufuin No Mori train

Day 6: Shopping in Tenjin, hakata station & canal city. Flight back home at 8:55

Thank you very much in advance for your kind help.