Start your day with an adventurous trek to Robber's Cave, also known as Gucchupani. The cave is a natural formation with an intriguing history and offers a refreshing waterfall to cool off after the trek.
Take a jeep safari through the Rajaji National Park to experience the thrill of spotting tigers, elephants, and other wildlife in their natural habitat. The park also has several trekking trails for those who want to explore on foot.
Visit the ancient Tapkeshwar Temple that is nestled in a cave and has a natural spring flowing over the shivling. The temple is known for its peaceful atmosphere and is a popular pilgrimage site for devotees of Lord Shiva.
End your adventure-filled day with a visit to the Malsi Deer Park, which is home to various species of deer, peacocks, and other animals. The park also has a mini-zoo and a children's park.
If you have time, you can also consider visiting the Mindrolling Monastery, Sahastradhara hot springs, or the Forest Research Institute. For a side trip, you can plan a day trip to Mussoorie, a picturesque hill station that is less than two hours from Dehradun.