[mgaunard]

"all free all the time" implies there is no one using them.

[ndriscoll]

Or they're always free of charge. I'm also used to there being dozens of free public tennis courts all over town, in multiple parts of the US, in both public parks and schools. I believe even the local private schools have courts that are open to the public.

[kasey_junk]

There is no time when my local parks charge for using tennis courts.