Day 1 : Chandigarh to Manali with on the way sightseeing... Sundernagar Lake, Mandi Pandoh Dam, Kullu Valley, River rafting point at Kullu after that complete night stay at Manali.
Day 2 : After breakfast... Manali local sightseeing... Hadimba Devi Temple, Vashist hot water, Tibetan Monastery, Club House. After that complete night stay at Manali.
Day 3 : After breakfast... Atal Tunnel and Solang Valley (Activities - Rope Way, Zorbing, Paragliding etc). After that complete drop at Chandigarh.
The road will be open till here and taxis will be able to go there.