Mussoorie & Dehradun

Hi all, I am planning to travel solo to cover the Rishikesh, Mussoorie, Dehradun belt. I'll be there in March 1st week and was looking for some cafe and trek recommendations or spiritual experiences. What is the best hostel to stay? In terms of view and organized tours/activities. I was also looking for some company to do the Nag Tibba trek. Thanks in advance for your help