Gangtok is the centre point of sikkim Make sure if you want to see snow you will have to go North sikkim ( nathula pass with permit / one passport size photograph , Gurudongmar lake yumthang valley.) in south sikkim u can visit pelling and ravangla. If you want to explore whole sikkim you need 15 days to explore.
Dear Ruup, The best season to visit Gangtok is ultimately a matter of preference and convenience. For instance, if you love snow and can comfortably bear low temperatures, you must visit Gangtok during winters. On the other hand, if you want to enjoy the greens of Gangtok, you may also visit the place during the summer season.
Gangtok in Summer:
The period between April to June marks the presence of the summer season in Gangtok.
With no probability of snowfalls or rainfalls altering your travel plans, the summer months vouch for a smooth travel experience in Gangtok. Moreover, if you want to avoid confronting bone-chilling temperatures, these months are the most recommended time for you to visit Gangtok. The average temperature hovers around 20 degree Celsius in summers.
Almost all of the tourist attractions in the city are accessible in summers. The major spots you can visit here are Tashi View Point, Namgyal Institute of Tibetology, Enchey Monastery, Bakthang Falls, Thakurbari Temple and many more amazing places in North Sikkim.
The activities that you can indulge in on your visit to Gangtok are cable car rides, mountain biking, river rafting, trekking, and paragliding. Besides, the picture-perfect vistas of the pristine nature also offer great opportunities for photography enthusiasts.