India is blessed with the largest of Himalayas range in its country. Unlike Nepal, treks and hikes here are not so crowded and gives travelers a chance to indulge more into rawness and wilderness of the greatest mountain range of the world. Here is a basic 5 Day itinerary of hiking in the grand Himalayas in eastern belt of the mountain range. This itinerary can be included or added while your visit in Kolkata , Darjeeling or Gangtok.
Same trip in 3 days can be done , if air transportation is opted for. Tickets are cheap from Kolkata to siliguri in flight.
Coming to this region and not tasting the happiness of climbing himalayas or getting intimate with it, might be regret , you build upon later. Hence i highly recommend this.
For hiking in North India, Connect directly.