You may either plan through a reputed Tour Operator (group tour or customised tour) or plan on your own after some research on Tripoto and Internet. Don’t fall into trap of little known operators who may offer at cheaper rate but take you for a ride later. If interested in Temples, there are many good temples (Shakipeeth) near Dharamshala and Kangra, else Shimla and Manali are always hot destinations for tourists..
Himachal has many Devi temles like as Chinpurni,Jwala devi .Senic of khajjiar,Meclodganj,.Dharm shala is worth visitng.Different treks are thete for truly enthuziastic people