Not sure if anyone's done this, but I made a map: http://imageshack.us/photo/my-images/
72/snowdriftmap.jpg/
I only got the good ending, so I don't know if the screen in the upper left is significant for other endings.
In case anyone else didn't realize this, you can harvest berries twice from each bush each day. I played most of the game thinking you could only do it once.
Also, there's a glitch where you can walk off the edge of the screen. It's usually around where you're supposed to be able to enter another screen, but you can also do it at the left edge of the top-left screen.