Hey Rahool, You can follow the following route : Chandigarh->Trithan Valley ( 5Days) -> Mandi(2Days-Prashar Lake Trek)->Parvati Valley(Malana,Kasol,Rashol trek,Tosh,Kheerganga trek -5 Days) ->Kullu-Manali( Rafting,Paragliding,skiing -3 Days).
Hi Rahool, you can start from Dharamshala, visit Triund and Mcleodganj. From there you can head to Bir-Biling, get involved in the Pragliding, explore the monasteries of Bir. From there you should head to Parashar Lake. After Prashar lake you can head to Parvati valley, Kasol, Tosh and Kheerganga trek. From there you can head to Kullu and Manali and end your trip there.
15 days lovely
day 1 ) delhi - chandigarh , chandigrah -reckong peo
day 2) reckong peo -chitkul if you want stay one day at sangla , rakchham and then chitkul
day3) chitkul
day4) chitkul - reckong peo
day5 ) reckong peo or kalpa stay and check out
day6)reckong peo - kaza by bus get down at nako stay at nako
day7)nako to kaza stay at kaza
day 8)either stay at kaza and check out dhankar , key , kibber , langzha ,mud , pin valley , gue, dhankar , tabo divide the days.
last 2 ,3 days ) kaza - shimla - delhi we are leaving on dec 22 let me know if interested
other options 1)mcloedganj , bir billing , dharamshala
2) kasol , manali, kheerganga trek, malana, manikaran, solang
3)dalhousie , khajjiar , tirthan and jibhi
4) chitkul ,sangla , rakshham , kalpa