Thanks Sharayu. It says on twin share basis. The winnergets to go using his/her credits and the +1 gets a discount. But the package costs are not mentioned there. Moreover it's not clear weather the Travel from the city (Delhi in my case) to Kasol or Parashar lake is included in the reward or not.
No It doesnt look like for Parashar or Kasol you will be sharing the room with a stranger. They are saying it is apt for people who want to take a friend or family member along. For the +1 the package amount is chargeable but discounted. I wonder what are the charges and if travel from and to Delhi is included.