What kind of honeymoon trip you are planning for ? Adventourous or laid back ? Explore parvati valley . Various options include - (manali and kullu zone) ; (Dharamshala , Mcleod Ganj , Bir biling and Palampur ) . I would suggest to not go to extra touristy spots like Shimla or new manali . If you wish to go Shimla side, try Shogi . It is a small village 30km before shimla and has one of the best romantic resort - Aamod, shogi .