If you have more time, you can add visiting Manikaran's castle and hot springs to your Day 5 itinerary. Also, you could spend a day in Kasol exploring Tosh, Malana and Camping on the banks of river Parvati. If you have less time, consider covering Manikaran on day 2 and Solang Valley and Jogini falls on day 3 along with a picnic to save a day.