Bike park? Flat place for toddler and 6 year old

Is there an equivalent to a skate park but for bikes?  I'm looking for a flat place for my toddler to learn how to bike and my 6 year old to have fun on her bike.  We used to be able to use the school yard at Bret Hart MS, however, it has been closed off to the public.  Any other recs?  Note, I'm not asking about child-friendly trails.  Thanks. 

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Thousand Oaks school in Berkeley is a great place for young kids to ride bikes. Have fun!

When my son was younger, we used Redwood Heights elementary school lot. I think it is still open.

You might also use the Corpus Christi parking lot on Park Blvd, at Estates.  (we attend school there). It is open and the local community uses it for basketball and play, so I'm sure you could find a corner to bike.

Bryan in Oakland

We used the UC Berkeley campus on quiet weekend mornings for this - you can find flat spots, but we were looking for the slight slope for learning how to balance without having to pedal at the same time (similar to learning on a balance bike, but with a regular bike).  Lots of wide open paved spaces!