Yumthang valley is alleged being essentially the most picturesque during the month of April-June as Rhododendron in a number of shades adds to the beauty of this valley. However, you will never be disappointed by this area. There are numerous tourist destinations you can pay a visit to in Sikkim https://heliskidirectory.com/listings13174733/indicators-on-nathula-pass-package-you-should-know