Hi Sirish
You can start your trip by visiting tirthan valley near kullu, it's the most peaceful place in Himachal, explore there for 2 days.
After that you can head to Manali, go for bhrigu lake trek, Solange valley or Himalayan park, it depends on to take 2-3 days in manali.
Now you have 2 days left, you can head either to Parvati valley or Shimla.
This completes your journey.
Well that is the ideal time to visit Aulo, Uttarakhand.
World level ice skiing competition is held their. for all the details about Auli trip just have a look at my block about it. link is given below https://www.tripoto.com/trip/a-road-trip-to-heaven-5c0795758ffaa
Hey! If you want to visit a less crowded place in Himachal go for Jibhi, jalori pas (3 days). You can also visit Teerthan valley and Kulli. In 5-6 days. If you want you can visit my profile to read about trip to Jibhi jalori.
Happy Travelling