Kedarkantha Trek at 12500 ft. which starts from Sankri at 6500ft. about 240 km from Dehradun is known for it's mesmerizing used in the trek it is best enjoyed in the mid December to end of January. you can read my detailed Trip on my profile. thank you.
December is a wonderful time to go to either Utrakhand or Himachal: The off beat places that you could Cover are in the state of Himachal where you will definitely find snow 1. Barot Valley
2. Parashar Lake 3. Rasol
6. Bhrigu Lake
8. Kalpa Valley
9. Chitkul These are some lovely places to have a lot of fun with snow