Manali shimla kullu are very common places to visit in summer. although they are crowdy enough during summer so i will not suggest you to visit. i will suggest you to visit Sadhupul in himachal. sadhupul is a very peaceful and loving place to visit. you can do riverside camping there. bonfire music..musical night..crystal clear flowing river..trekking make it different from other place. it is quite budgeted place.