Morning: Start your day with a visit to the famous Robber's Cave. You can explore the cave and enjoy the natural beauty of the place.
Afternoon: You can indulge in some adventure activities like trekking and rappelling.
Evening: You can enjoy a picnic by the stream that flows through the cave or visit the nearby Zonal Anthropological Museum.
Morning: Start your day with a visit to Mindrolling Monastery, one of the largest Buddhist centers in India. You can explore the temple and admire the intricate architecture.
Afternoon: You can indulge in some shopping at the Tibetan market near the temple.
Evening: You can end your day with a visit to the nearby Tapkeshwar Temple, dedicated to Lord Shiva. You can witness the evening aarti and enjoy the peaceful atmosphere of the temple.
You can also visit Rajaji National Park for a wildlife safari or visit the Forest Research Institute to learn about the flora and fauna of the region. For a side trip, you can visit Mussoorie, a hill station located just 34 km away from Dehradun. To maximize your fun, you can plan a food tour and try the local delicacies of the region like aloo ke gutke, kandalee ka saag, and bal mithai.