Manali (2days)
try paragliding, river rafting. visit solang valley local cafes, market sight seeing
Kasol(2days) kheerganga trek, hot springs,
Tosh( 2days) cafes and point
visit malana village/ magic valley in return from tosh to manali route
You can plan for tirthan valley, if you want to go for some less crowded places.Tirthan valley has lots of places to explore. you can check for places like: jibhi
serolsar ghnp
gushaini
sojha.
The itinerary depends on the place you will start with. of coming from Delhi would recommend. 1 day travel to Shimla 2shimla to chitkul
3 chitkul to kalpa
4 pooh
5 tabo
6 gheu monetary.