We visited Sikkim for 4 days in the month of February. We planned the entire trip on our own. Tsomgo lake was the main highlight of our Sikkim Trip. Tsomgo/Changu lake mostly remains frozen from Dec-Mar and the view is mesmerizing.
As we were on budget trip, we took an overnight Express train from Kolkata to New Jalpaiguri. We reached New Jalpaiguri (NJP) in the morning and from there we took a shared cab to Gangtok. It's a 4 hours drive from NJP. Cost for shared cab is around 400 Rs per person or around 2000-2500 Rs for personal cab. The entire cab journey was full of hair pin turns, but the view of Teesta river flowing along keeps you engaged.