Maizuru Park and Bic Camera Tenjin stores

Hello,

We will be visiting Hakata city in Fukuoka this November for the first time, and have some questions:

1. Does anyone know roughly how much time we should spend in Fukuoka Castle Ruins park? We have watched NHK's Kuroda Kanbei taiga many years ago and excited to see the historical museum and park. Looking at the map we will probably cover only half of the park as we have plenty to do that day.

2. We are planning to see the main castle tower, maybe Koroan and the Visitor Centre and end at Tamon Yagura. From here we plan to go to Yatai food stalls for dinner, and planning to stop by Bic Camera to get some camera gears. Which stores have the camera department: Tenjin Store 1 or 2?

3. Is the Canal City mall worth visiting, it looks interesting from photos.

4. Is the Tochoji Temple worth visiting?

Cheers!