Thank you for your thoughts, appreciate it 
Imo it is a designated picnic area with a permanent table and seating hence it qualifies as such, take a look here: Picnic Areas
My argument is that yes it is a great place to socialize and in some degree also explore since it is kinda hidden away and you wouldn’t spot it immediately when walking by. Also, you could argue that one can exercise on the surrounding area.
It is not located on school grounds, only next to a kindergarten.