Morning: Begin your day by taking a serene walk around the Naini Lake, surrounded by lush green hills and a cool breeze. You can also opt for a boat ride and enjoy the serene view of the lake.
Afternoon: Head to the Tibetan Market, which is located near the lake, and indulge in some shopping for souvenirs, clothes, and handicrafts.
Evening: As the sun sets, visit the Hanuman Garhi temple, a popular spot for watching the sunset. The temple is located on top of a hill and provides a panoramic view of the city.
Morning: Visit Tiffin Top, a popular viewpoint that offers breathtaking views of the Himalayas. The view of the sunrise from here is especially mesmerizing.
Afternoon: Take a stroll in the Eco Cave Gardens, located at a distance of 10 minutes (2.8 km) from Tiffin Top. The gardens have six interconnected caves and several hanging gardens, making it an ideal spot for nature lovers.
Evening: End your day by watching a movie at the Kumaon Cinema, located in the Mall Road. The cinema has a nostalgic old-world charm and is a perfect way to end your trip to Nainital.
Apart from the above itinerary, you can also consider visiting the Governor's House, which is located near the Mall Road. It is a beautiful colonial era building and has a well-manicured garden.
Another side trip that you can take is to visit the Jim Corbett National Park, which is located at a distance of around 64 km from Nainital. The park is known for its tigers and flora and fauna.
To maximize your fun, you can also try out some adventure sports such as paragliding, rock-climbing, and rappelling.
Finally, don't forget to try the local cuisine which includes dishes such as Bhatt ki Churkani, Aloo ke Gutke, and Bhang ki Chutney.