Start your trip by exploring Dehradun's popular attractions including the Sahastradhara or the 'Thousand Folded Spring' which is renowned for its therapeutic properties, and the Robber's Cave, a natural cave formation. Don't forget to visit Tapkeshwar Temple, a holy temple dedicated to Lord Shiva.
Enjoy a day-trip to the hill-station of Mussoorie. Begin at Kempty Falls, a waterfall that's a popular spot for picnics and swimming. Take a horse-ride from Kempty Falls to the peaceful Gun Hill Point, a viewpoint that offers panoramic views of the surrounding Himalayas. End your day with a visit to the Mussoorie Adventure Park, an amusement park that offers various adventure activities.
Head back to Dehradun and visit the Mindrolling Monastery, a Buddhist temple known for its striking architecture and peaceful atmosphere. Spend the evening at the Dehradun Zoo, home to a wide variety of animals including tigers, leopards, and Himalayan black bears.
Take a leisurely drive to the picturesque town of Nainital. Start your exploration with a boat ride on the famous Naini Lake surrounded by green hills. Take a cable car ride to the famous Bara Pathar Temple and enjoy the breathtaking views of the surrounding hills. End your day with a visit to the Tiffin Top or the Dorothy's Seat viewpoint which offers stunning views of the Himalayas.
Start your day with a visit to the Nainital Zoo which is home to rare species such as the Red Panda and Leopard. Head to the Naina Devi Temple, dedicated to the Hindu goddess Naina Devi. Spend your evening at the Mall Road Market, a popular shopping destination, and enjoy the delicious local cuisine at one of the restaurants.
End your trip with a visit to the Kilbury Bird Sanctuary, a must-visit for bird watchers. Take a guided tour to spot a wide variety of birds. Alternatively, you can spend the day at the Himalayan Botanical Garden and Nursery, a lush garden showcasing the region's flora and fauna.
The trip can be extended to include a visit to the Corbett National Park, one of the most famous wildlife sanctuaries in India. Or, you can add a day-trip to Rishikesh for some water and adventure activities such as rafting, bungee jumping, and camping. If you are short on time, Mussoorie can be visited as a day trip from Dehradun. Alternatively, instead of Nainital, you can visit the nearby town of Bhimtal which is also known for its scenic beauty and peaceful environment.