Interlaken is a great place, especially if you are into outdoor activity. As for the other places mentioned, I have been to Zurich and it really is not worth a visit. Very expensive (even for Switzerland) and not really much to see or do. Lichtenstien might be cool to visit because how many people actually make it to that place? It is tougher to get to as no trains run through the country so you will have to go by bus. I had a friend spend a few hours there and he said there really was not much there either.
If you are into skiing, hiking, ect., I would suggest some of the other mountains towns in Switzerland (which right now escape my mind, but hopefully some others will chime in with help).