Gangtok is covered in lush green mountains and rivers which gives a wonderful sight in any direction we look. The air is pure and fresh and it's refreshing. We stayed there for a week and it was a great escape from everyday rush and pollution form city life. I would recommend local sight seeing such as Mahatma Gandhi road and nearby lakes around gangtok over far off tourist places, but do visit Nathula pass, the indo-china border, it is a mountain peak covered in snow and the road to destination is a mesmerizing view. Travel tip : Always carry thermal bottle for warm water and carry winter cap for your ears. As far as my experience all the tour guide and taxi services were genuine, they took reasonable price and there behavior was polite, they haven't tried to scam us in any way. The ambience was surprisingly good. Best time to visit gangtok : November and December. If you want to have a snow fight visit zero point, it's a long journey from gangtok but if you go there on winter it will be worth it.