Welcome. The road may get closed but are opened asap. Your entry to Gurudongmar lake path after 15000 cafe will depend on the weather of that day. When you will book on Mall road they will tell you exactly about the weather condition. There are many local tour operators there on Mall road. Book after visiting many shops and Don't forget to bargain the rates.
Hey Sushmita, On the first day you can reach Gangtok and Roam around the city in the evening .. Day 2 :- Visit tsongmo lake and baba mandir ... Day 3 : gangtok to pelling. Visit siddeshwar dham on the way ... Day 4:- Entire day in pelling ... Day 5 :- Return to new jalpaigudi ... Happy Travelling!!!
Hey!
My itinerary for Gangtok is follows https://wandersagas.wordpress.com/2018/01/12/travel-diary-gangtok/
Please do have a look, i have shared all the details regarding best places and my experiences.
Also, you can check my profile where i have uploaded a photo blog of Gangtok.
I hope it helps!