Oh, how exciting! Gangtok is a beautiful destination with so much to offer. Here's an ideal itinerary for your 4-day trip:

Day 1:

• Start your day with a visit to the Enchey Monastery, a serene and picturesque Buddhist monastery.
• Head to the Namgyal Institute of Tibetology to learn about Tibetan culture and history.
• Enjoy a leisurely stroll along the MG Marg, the main street in Gangtok, lined with shops and eateries.
• End your day with a visit to the Banjhakri Falls and Energy Park for a peaceful evening surrounded by nature.

Day 2:

• Embark on a day trip to Tsomgo Lake, a stunning glacial lake located at an altitude of 12,400 feet.
• Visit the Baba Harbhajan Singh Mandir, a revered shrine dedicated to an Indian army soldier.
• Explore the nearby Nathula Pass, a historic mountain pass on the Indo-China border.

Day 3:

• Start your day with a visit to the Rumtek Monastery, one of the largest and most significant monasteries in Sikkim.
• Head to the Hanuman Tok viewpoint for panoramic views of the surrounding mountains and valleys.
• Visit the Flower Exhibition Centre to admire the vibrant flora of the region.

Day 4:

• Take a day trip to the picturesque town of Pelling, known for its stunning views of the Kanchenjunga mountain range.
• Visit the Pemayangtse Monastery, one of the oldest monasteries in Sikkim.
• Explore the Rabdentse Ruins, the ancient capital of the Kingdom of Sikkim, and enjoy a peaceful walk amidst the historical remnants.

Remember to savor the local cuisine, interact with the friendly locals, and immerse yourself in the rich culture and natural beauty of Gangtok. Have a fantastic trip!