Since Manali -Leh Rd. is going to open from 10th April, you can visit it from that side only. Day1 Chandigarh-Manali
Day2 Manali to Sarchu or camp at keylong instead of Manali.
Day3 Sarchu to Leh (book in advance to avoid the tourist rush)
Day4 rest and take a day or 2 in Leh.
Day6 Go to Nubra Valley for an excursion for 3days
Day6 Trek in Hemis Monastery for 2-3 days in homestays
Day9 you can also visit zanskar valley (through kargil take another 3 days) or try rafting in Indus
Day 10 return via Manali and before Manali take a left to batal to visit Chandrataal (excursion of 50km)and could also continue towards spiti valley
Chandigarh - manali in manali u need to take permits to cross rohtang pass from manali start early in the morning so there will be no more flow of water at water crosses. u can stop at jispa and pang.
It depends on riding.