Hello nikhil here are some places Tsomgo Lake. Image Source. Yuksom. Nathula Pass. Lachung, Lachen and Yumthang Valley
Ravangla. Namchi. Zuluk. teesta River. hope you have great fun
Gangtok is the place to visit , Buddha monastery, hiking and ropeway fun..
pelling is another beautiful place to visit yumthang valley of flowers if love watching nature than it's best here! thangu lake
You have Gangtok - bhanjakri falls, Bhaktang falls, Ganeshtok Hanuman tok, Tsomgo lake, Baba Harbajan singh mandir, Nathula Pass.
You have Pelling and Lachung - Mt katao and yumthang Valley