In the morning, explore the enchanting Robbers cave, which is a natural cave formation where streams of water flow. You can stroll around in the cave and even take a dip in the cold water. In the afternoon, head to the Forest Research Institute, which is one of the oldest and largest institutes of its kind in Asia. You can go on a guided tour of the museum and witness the rich flora and fauna of Dehradun. In the evening, visit Tapkeshwar Temple, which is located in a cave and has a natural spring that flows through it.
Start your day early and drive to Rajaji National Park, which was named after freedom fighter C. Rajagopalachari. Here, you can take a jeep safari to spot wildlife like tigers, leopards, elephants, and more. In the afternoon, indulge in some adrenaline-pumping activities like rappelling, rock climbing, and river crossing. Head back to the city in the evening and relax at your hotel.
Other local attractions that you can consider visiting are Sahastradhara, which has a beautiful waterfall and is known for its therapeutic sulfur springs. You can also go on a trek to the highest peak in the region, Mussoorie. If you have time, take a day trip to Haridwar, which is a holy city and has several ancient temples.