How to identify the Parallel Datum Plane of a Solid Part Surface.

Hi

I have to process all the parts in an assembly to export in DXF drawing format.

So, one assembly level drawing will be created with views of Solid Parts. 

However i am not sure how to identify the right view or plane. 

As most of the solid parts are rectangular plate items. I am trying to get the surface with largest area. 

now how to identify this surface is parallel to which Datum plane.

So that i can place a view in Drawing.

If you have a better idea please let me know.

Rakesh