Hi Tishika,
These are some of the places that you can consider for your trip to Sikkim. Please note that it gets chilly during December and you will have to carry woolens/jackets to stay warm.
- Darap Village
- Rimbi Waterfalls
- Rock Garden
- Mall Road
- Kunchenjungha Water Falls
- Khecheopalri Lake
- Tiger Hill
- Ghoom Monastery
For slightly longer duration trips that last for about 2 to 3 days, you can check out Nathula Pass, Lachung, Yumthang, Lachen and Gurudongmer Lake.
Best of luck and safe travels!
-Eeshat