There is no If it is an outlet, it is Marinoa City, though it is not very good.

Even if the Canal City parking lot is full, there are many coin parking lots nearby.

There is no supermarket.

As far as I know, there was a Hallyu specialty shop called “O'Z”. But I'm not very interested in Hallyu, so I focus on things like "Shirotan" and "Evangelion".

Is there a boat that can tour the canal?

There are plenty of things to see, lots to buy and lots of food to eat, so do not spend a few hours shopping.

No there is not

It is close to getting off at Nakasu Kawabata Station and going through the Kawabata shopping street if it is a subway. Is it about 10 minutes on foot from the entrance to the exit of Kawabata shopping district? Walk from the station and you will find escalator to Canal City on the right side of the shopping street exit.