Visit Ramnagar and try to go nearby hilly areas ..its completely untouched and less crowded.Check my blog for more info.Bir is another good option visit ,don't forget to visit tea plantations in Dharamsala
If you want go to some remote and less crowded place and interested in trekking then you could choose tirthan valley. There are lot of places you could visit in tirthan.
From tirthan Manali is also approx 50kms. And tirthan valley is very beautiful.
Sure Sir, You can checkout the untouched valley known as Tirthan/ Banjaar Valley and place called JIBHI. It's a 2-3 hour drive drive from AUT tunnel in Himachal. It's far better than anything. I would suggest you to stay at a place named as "NOSOCIETY CAFE & HOMESTAY". If you wish you can also checkout other places as well. Tirthan Valley is filled with tree house culture, trout fishing culture and so many more things. You can contact me for photos or anything else. Apart from this, i would love to join you