Is there any place where kids (on a field trip) can eat their lunch? If not inside the building perhaps somewhere public outside?

There's a park right in front of the building across the street. There is also a downstairs of the museum that I did not see.

There's a park right in front of the building across the street. There is nothing for food outside the building.

There is, what can be consider a park next to the building but not much seating available.