Boone Acres Park at San Ramon, San Ramon, California.

Lots of open green grassy space, sports fields, fun play structure equipment fir both tiny tots and older children as well. Plenty of sun, with plenty of shady spots to escape the heat and there's usually a cool breeze in the later afternoons. There's a few benches for us grown ones to watch over and read or secretly play games on our phones, also a few tables and benches for picnics and BBQs...and yes, there are public bathrooms available but I'm fairly certain they're only unlocked during daylight hours. It is adjacent to Pine Valley Middle school, however I do not believe that they use the heart of the park for recess.