Har ki Doon

Hi Friends

I have planned trek from 15th April. To reach sankri , i came across two paths.

1) take bus from rishikesh, i have to get down at gesua bend and take another bus to mori and share jeep to sankari

2) take bus from dehradun which will go through mussourie. i think it is shortest path. I m only concerned about bus avliabilty and timings from dehradun.

Can anybody help me to suggest the path and timings from dehradun.

Thanks in advance