If you come to Mashobra, you just do not miss one of Asia's largest watersheds, supplying water to Shimla. The Reserve Forest Sanctuary is a must visit not only for being popular in the continent, but for the lush coniferous cover surrounding it, but also because it is a birdwatcher's delight.
The weather is always pleasant, so you can pick up your camping bags and trek to the Sanctuary, camp out with friends or family and don't forget to carry your binoculars. You might just spot the famed pheasants, partridges and chikors here. Keep an eye out for the monkeys though. However, prior permission is required to visit this reserved area.