Manali is the best place for a family vacation. There are many places to visit in and around Manali. Best time to travel is in the morning as the traffic will be less and you can get best sightseeing and there are many good viewpoints.
Road condition is not much good. Journey will be comfortable with your own vehicle as the cabs are costly one and if you chose bus you have to wait for a long time. The place is best for hangouts with your loved ones.
The traveling was too hard, it was really a hard time for me as I have not traveled in the hilly area previously. But once we reached at the destination, it was amazing. If you drive safe you will enjoy a lot during traveling. Should try this once in life.