Understand map contours, make a 3D Model of a hill.
this web page!:
otherwise I have converted it into a pdf
Loads of carboard boxes
I can't claim that I creted any of this content, only published a link to the site that I found this activity on.... It's great.
explain what information you can get from a map. Point out roads, rivers, train tracks and other items, but then explain that the map is actually a 3d picture looking from above.