Treks which are in the Indian state of Sikkim or part of Darjeeling in West Bengal. When we think about Eastern Himalayas, it has to be wither Sikkim or Darjeeling.
Being geographically connected, Sikkim and Darjeeling are similar in many aspects. Be it weather wise or culturally.
Below are the diversified trekking options in this relatively smaller region from which you can surely pick one as suits your taste.