We recently had a chance to visit Kasauli for a weekend around June end. To say the least the trip was wonderful as the place. In my view Kasauli must be the only real hill station left in India(a big thank you for to the Army authorities who maintain it).
With a complete ban on commercial activity the place retains its old world charm. All of you who work very hard during the week can actually look forward to some real relaxation while in Kasuli.
Before leaving book your Hotel. Alasia is recommended since it retains its old world charm. This is must see place for all of you who can live in peace doing basically "nothing".
Early morning walks are so much fun. One day walk till the Kasauli Resorts and may be have lunch there. The buffet is okay and in any case there is no other place to eat around it. Also try some local wines produced in the Shimla Hills, Shogi. Peach and Strawberry were quite good.
My only request to the owners of Alasia, please do some well deserved maintenance to your Hotel in some places it si falling apart.