You could start with
Tsomgo lake popular locatedv12400ft high
Lachen is serne vegetation part of Sikkim
Kanchenjunga is a UNESCO world heritage site
Zuluk is called as eastern hamlet of India which is dainty. Yuksom is another beauty town covered with lush greenery
Goecha la faces the Himalayas where trekking is popular. Ravlang, geyzing, Yangtey,Biksthang, Mangan are some more best visits of Sikkim.
https://tripoto.page.link/kwvGhi6xjHKtXNWb7
Kindly check the above Tripoto link for more details.
Go visit all these places, you won't regret it:
Gangtok
Tsomgo Lake
Nathula Pass
Kanchenjunga Base Camp
Lachen, Lachung and Yumthang Valley
Teesta River
Gurudongmar Lake
Goechala
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