I just imagine Mistvale as it looks on the campaign map, honestly. Just a big ol' lake with trees surrounding it. I was pretty sad when I first joined and clicked on it, and couldn't get to Mistvale. After rereading the campaign text, I feel like adding that it's got a nice marshy surrounding. I'd like to pretend that the reason we can't go to Mistvale is because the forest has grown too close together akin to Darkwood.
Also any time I go to Korvo's wolf page and see "Korvo does not have any friends" I cry.