Hey,
Himachal is a vast land with a plethora of things to do and places to visit.
If you have your own vehicle then you can explore the entire Spiti Valley in October. If not you can visit the circuit of Manali, Kasol, Tosh, Manikaran where there are more backpacking options.
Check out this link and see which fits your requirements best, it has packages, trips, itinerary, and stay options - https://www.tripoto.com/himachal-pradesh?params=%7B%7D
Amazing. There are so many places in Himachal As you know bro. You can go for 1.Delhi-Bhuntar-Kasol-Manikaran-Tosh-MalanaVillage. This trip will be amazing for 5 person. I have experienced this as my first trip. 2.Secoundly you can go for McLeodGanj. It is also good place to spend some time. You can