This is actually a well designed playground, but the location is not ideal. It is right near the Union City Bart and I rarely see many other kids at the playground.
Multi level structure with ladders, bridges and slides. Multiple bouncy horses. The ground is a mix of wood chips and soft foam. The Bart train is actually a bonus for my toddler, because he likes to watch it go by every 10-15 minutes.
The parking areas are not close to the playground. You have to walk across the park.
There are bathrooms in the community center in the same parking lot.
Not a lot of shade at the playground, so bring a hat. There are benches around the perimeter.