If you can't go UP with a large enough berm, etc. how about down? What's your water table situation? Can you do a dug out patio/courtyard area for sitting and teaching in?
"The world is changed by your example, not your opinion." ~ Paulo Coelho
Those are the largest trousers in the world! Especially when next to this ad:
Looking for cold-climate growers to join a GOOF livestream panel (Missoula)