Hey Abhishek, Hill stations you can visit fron Delhi : 1) Parvati Valley (Kheerganga trek-one day trek, Tosh, Malana, Kasol) 2)Dharamshala (Triund trek-one day trek, Naddi, Dalhousie, Macleodganj) 3)Mandi (Prashar lake trek-One day trek) 4)Kedarkantha trek (5 days trek, Uttrakhand-Dehradun, Rishikesh, Mussourie) Hope this would help you.