This park opens at 7 a.m. daily until dusk. It's free, concrete, outdoors, and pads are required. Purkiss Rose really coulda put a better design into that street stuff. Everything goes downhill right into the fence (You can see the pic above and make your own evaluation). The deepest transition is 5 feet. There's a spine connecting two bowls. A couple rails and ledges around the perimeter that are good.
You'll be far better off going a couple miles down the road to the Chino park unless you want to get away from the crowds.