some of the famous hill stations of North India are -

Leh, Lahaul Spiti, Shimla, Dharamshala, Dalhousie, Mussorie, Chamba, Chail, Kufri, Kasauli, Manali, Narkanda, Srinagar, Nainital, Almora, Gulmarg, Auli.

Hello, definitely I'll suggest you some good Hill Stations in North India. North India is blessed with numerous hill stations that are mainly focused on Uttrakhand, Himachal-Pradesh, Jammu & Kashmir.

some of the good destinations listed here where you have to definitely visit  once in a lifetime : 

- Leh-Ladakh 

- Lahaul-Spiti 

- Manali 

- Srinagar

- Kasauli

- Dharamshala

- Dalhousie 

- Chamba 

hope it's going to help you !