Saga is one of the smaller cities in Japan but every year people from all over the world go there for the hot air balloon festival when if you watch up you will see the sky full of the hot air balloons. Saga is also known for the Imata/Arita porcelain. If you would rather do something more action-packed, there is also the Ninja Village Hizen Yume Kaido where you can train for a day in the arts of stealth on how becoming a ninja. It has also many other ninja related attractions in it. And as most of the cities in Japan Saga as well has couple of castles that are always nice to visit at