I like the oak trees. Giant old trunks.

As much as I like fine wood, in my current play-through, I have not chopped any down. I was thinking it would be nice if there was something special that would happen if you didn't cut any down.

Or another thing like killing starred deer and boar. If leaving them alive would populate the world more with starred animals of that type. I think a reactive environment would be really cool in this game.