Hi Priya, Here is a suggested itinerary for a day trip from Dehradun to Mussoorie and Landour: Morning: Start early from Dehradun and drive to Mussoorie. The drive takes about 1.5 hours. You can stop at the Dehradun Mussoorie Bypass Road for breakfast. Afternoon: Once you reach Mussoorie, spend the afternoon exploring the town and visiting some of the popular attractions. Some of the must-see places in Mussoorie are: Gun Hill: This is the highest peak in Mussoorie and offers stunning views of the Himalayas. You can either take a cable car or trek up to the top. Lal Tibba: This is another popular viewpoint in Mussoorie. You can see the entire Himalayan range from here. Mussoorie Heritage Centre: This museum is a great place to learn about the history of Mussoorie. Christ Church: This is a beautiful church with a stunning view of the mountains. Evening: Take a walk around the town or enjoy a meal at one of the many restaurants. Night: Drive to Landour, a small hill station located about 6 km from Mussoorie. Spend the night here and enjoy the peace and tranquility of the place.