Sadly, I have not been back to Cape Kidnappers since December 2004, so I have not seen The Farm. However, I don't see how it could possibly be "a notch up" from The Lodge at Kauri Cliffs, which is the nicest accommodation I've ever stayed in. There aren't any more notches above that, just the heavens above.
Matthew:
How many balls you might need depends on how aggressively you play the course. Unless the wind is over 25 MPH, though, two sleeves should be plenty.