If you are planning with friends to visit shimla sorry its a bad idea. I have a bad experience of the place not as beautiful as it used to be in past.its so crowded that it took almost 2 hours just to find a parking apart from that I did not find any scence of roaming here and there on ridge.
There is a zoo in kufri which is ok and on the way their is sighting place which is beautiful else its horrible. We planned our vacation for week but we came back on 3rd day.