After the chaotic hecticness of the big cities of the Plains, the Indian Himalayas make a relaxing change. A holiday in their holiday for some, others make the Himalaya North their sole purpose for coming to India.
Bus: This is the main way to get around the Himalayan north, the only choice in many places. The winding roads, and steep slopes makes for some nerve raking travel experiences; but the views more than make up for it.
Train: surprisingly there is also very limited train service. Known as the "toy train" it connects Kalka and Shimla, it was a remarkable engineering feat in it's day, now it makes for a slow but beautiful tourist route.