Share 'Places to Play in Near North Side & North Shore?'

Can anyone suggest any courts in good shape downtown or in the North Shore?  I've had good luck at Gillson Park in Wilmette and looking for similar parks, or perhaps a high school.  I'd also be interested in places in other nearby surrounding communities (Oak Park, etc...)I'm pretty tired of having to watch people fight over the rules regarding racqueting courts at Oz & Lake Shore and the Wav…