Some of Fantasyland's rides close, and all of Toontown, of course.
Big Thunder Mountain Railroad is OPEN and it's an amazing, almost surreal, experience.

If you listen to last week's DIS Unplugged podcast, there's a tip about seeing the fireworks from the Storybookland Canal Boats too...I've heard of that before, though I've never tried it myself, and there was some debate among the podcasters as to if the ride is actually open or if the person who submitted the tip just hijacked the boat...