This extensive article discusses various ways in which Kumamon is being used to promote tourism.

https://japannews.yomiuri.co.jp/features/travel-spots/20230902-133726/

It says that Kumamon Square is is located in the “Tetoria Kumamoto Building,” which probably won’t help most people find it. Here’s a page that shows its location in the Tsuruya Department Store downtown:

https://www.kumamon-sq.jp/en/

Note that “Suidocho” should be capitalized. – Kirk