Tirthan Valley is one of the most enchanting places I have ever been to in Himachal. Recently, I got a chance to travel to Tirthan Valley for a work project. I was there for 3 days during which I visited many major sightseeing places.
You must visit Chhoie waterfalls and go for GHNP trek which is around 9 Km one way.
There are no major cafe and restaurants, so you will have to rely on homestay food.
There are many homestays options in Tirthan Valley costing you around 1500 - 2000 INR and they will serve you with authentic Himalayan food plus make sure that you have a time of your life.
Here are few pictures from my journey, I hope you like them :-)