Park with a kid's playground, BBQ grills, picnic shelter, restrooms and lots of green grass.
We stopped by Sumac Park on our last trip to Agoura Hills. It's a simple playground with your usual play structure and picnic area. I'm potty training my toddler at the moment, so it's always nice to see restrooms, so I don't have to deal with him peeing out in the open. No special features, but a nice neighborhood park.