Dehradun district is really two destinations stacked vertically: the Doon valley capital with its institutions and café culture, and Mussoorie, the Raj-era hill station 35 km and a thousand metres above it. Together they make the most-travelled weekend circuit in the state.
In the valley, the anchors are the Forest Research Institute's colonnaded campus, the Mindrolling Monastery's great stupa in Clement Town, Robber's Cave's river-in-a-gorge, and the length of Rajpur Road for bakeries and bookshops. Dehradun works best as a day of easy sightseeing before the climb.
Mussoorie is where a trip gets personal. A relaxed two-day loop takes in the walkable stretches, Gun Hill at sunrise, Camel's Back Road, and Cloud's End where the ridge finally runs out of town, with plenty of momos on Mall Road and quiet corners around Landour's Char Dukan. Kempty Falls, 15 km out, absorbs the day-trip crowds and lets the ridge stay quiet.
March to June and October to December are the comfortable windows, and the post-monsoon weeks give the famous winter line of snow peaks from Lal Tibba. With the airport at Jolly Grant and a fast train to Dehradun, this is the one Himalayan district that genuinely fits a two-day plan.