Is there grass gravel. Dirt or mulch?

lots of grass, some woodchips in the play area. there is gravel at the dog park

For the dog park, I don't think it will be prone to mud/standing water. So if the weather has been yucky, this is the park to go to. There is a water fountain, but I don't think it's been activated yet, so bring your own water.

The dog park has gravel. It is smaller than pea gravel though. It is called breeze gravel.

All of it.