There is a Liuliqiao Primary School in Fengtai District to the east of Liuliqiao North (not Beili).

There is Beijing Institute of Education Fengtai Branch in the south of Liuliqiao.

A playground with a runway. It's near Liuliqiao. Not far.

There should be no big problem, just tell the doorman, or go to Lianhuachi Park, which is also a good place. It's not far from Liuliqiao.