Dear fellow traveler, personally I don't think it's the right time to travel. In the month of august the monsoon is in full swing in this region, so I advise you to postpone your trip till the month of October.
From zoological park to waterfalls to revered shrines, Dehradun has it all. Tapkeshwar Mahadev temple, Sahastradhara, Robber's Cave, Malsi Deer Park are some of the popular places of interest in and around Dehradun. The beautiful hill station of Mussoorie is situated just 30 kms from Dehradun.