1255 Hetfield Avenue, Scotch Plains, NJ.
Quiet place, but a good amount of ramps, winding around for kids to run around and various slides in this playground.
See pics below.
2 sets of swings in the lower area, and ball field is on the other side.
You can also grill here and there are a good number of picnic benches.
Bocce stations and Tennis court is also in the same area.