I've never been to Sikkim, but I was planning to, for a while. I know somebody who is involved with running a school there, and, according to her, it's gorgeous. From what she said, it sounds like it can be hard to travel around it. To get to the school, for instance, we would have had to arrange a jeep from the nearest town, which would have taken us hours. I'm also not sure that it's the safest place to be - I think I remember her saying that sometimes there's military presence there. Nevertheless, apparently it's beautiful. If you find anything out that's more concrete than my memories, or if you go, I'd love to hear about it!