Explore Parvati valley, go to Manikaran Sahib Gurdwara, board a taxi and head to "Gulaba," near Manali, it's like a peaceful hideout, far better and beautiful than Rohtang Pass. Go to Kullu for paragliding, which is better than Solang valley ,. There's nothing to do in kasol for 5 days,. Go to old Manali and explore the amazing cafe's there!!
Then visit Grahan and waichin it's the good option and both are very less crowded places and new community and culture to explore there and very peaceful places