If you are looking for adventure, Romantic, Peaceful, and Religious place, then Sikkim is one the best destination to explore. Gangtok is the capital of Sikkim and gateways of high altitude hill station like laachun-lachen-Yumthang. Sikkim shares an international border with China, Bhutan, and Nepal.
To experience a new culture and tradition, you need to spend at least a week to understand local people. Sikkim can be reached by Air/Rail/Road. The nearest airport is Bagdogra which is 110kms from its capital Gangtok. The nearest railway station is NJP.
Surprisingly, There are loads of tourist attractions in Sikkim, few of them are Yumthang Valley which is in the heart of Lachung (North Sikkim), Tsomgo (Changu) Lake Gangtok (East Sikkim), Pelling a paradise in West Sikkim, Tsomgo (Changu) LakeGangtok (East Sikkim), and Buddhist Circuit (Sikkim).
Please have a look at various destinations of Sikkim and thus plan your tour according to your budget and requirements.