Dorset Play Park, Dorset Road, Boronia
There are two table tennis tables. Ping pong bats and balls are available from local cafes and next door at the Boronia Police Station (make sure you don't have any outstanding arrest warrants if you get them from here).
A local band could practice here with eight different unusual musical instruments including xylophone, drums, percussion pipes, bells and musical flowers. Unshaded seats.
Photos:
Location
257 Dorset Road, Boronia 3155 Map