*************SPOILER*******1: I was shocked when I saw a Snow Elf, because obviosly on the loading screen it tells you that the Falmer were once known as the Snow Elf. It was cool to see what the race used to look like. Also there was a cool twist, they are brothers and one is Eevil and one is good. I find it very interesting.
2: I also loved how they really outstanded vampirism. Before it, it was just plain and to the point. Now there is a wahole quest line for it.
Edit- 3: Hellhounds. Idk why but that was very awesome to see, in my opinion.
What are your favorite things for the DLC?