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
There's no place like 127.0.0.1. But I'll always remember this tiny ad:
Our PIE page has been updated, anybody wanna test?