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Hey! Do check if North Sikkim has been opened up for tourists, and if yes, then you can always follow this itinerary here. Day 1 - Overnight stay in Gangtok. Explore the city.
Day 2 - Leave early for Lachen. It's a long (and beautiful) ride so make sure you leave Gangtok on time. Overnight stay in Lachen.
Day 3 - Leave your hotel by 4:30 am for Gurudongmar Lake and Chopta Valley. Come back to the hotel, have lunch and leave for Lachung. Overnight stay at Lachung.
Day 4 - Start early for Zero Point and Yumthang Valley. Come back to the hotel, have lunch and proceed to Gangtok. Overnight stay in Gangtok.
Day 5 - Return! This will of course need you to increase your trip duration by a day, which is for the best, but if in case this doesn't work for you, you might try to combine day 4 and 5 together, skipping the stay in Gangtok, but do talk to your driver beforehand to find out if it is feasible. Because you'll have to take a late night train or a flight in that case, and there might also be a risk of you not reaching on time because hill roads are often unpredictable.
The other easier option might actually be skipping the first overnight stay in Gangtok. But do take a train or a flight that reaches early, in that case, so that you don't get too late reaching Lachen.
I hope this helps!
The whole sikkim is so beautiful that cannot be covered in 4 days, but here are popular destinations
Yuksom, Gangtok, Tsomgo Lake, Nathula Pass, Pelling, Lachung, Ravangla, Rumtek Monastery, Namchi, Do-Drul Chorten, Zuluk, umthang Valley, Gurudongmar