There is a split road there but the road is collapsed.

This is two different buildings entirely. One is from the STM and the other is the university.

Toilets are available here with limited hours.

To my knowledge, the benches are not like that and there are not that many. The park need to be rebuild with the proper amenities too.

Boundaries of the parks are usually not that far. This is often another park by itself.

To my knowledge there is no real castle in Laval. Need a second person to confirm.