Have early breakfast (At times Packed breakfast) and leave for Thangu Village (4100m / 13450ft), a remote high altitude village of Tibetan Nomads & Chopta Valley on your way to the Gurudongmar Lake.
Thangu valley occupies a very broad valley at the junction of Thangu Chu, Chopta Chu, & Lassur Chu. It is situated at an altitude of 14000ft.
Chopta Valley is situated at a height of 14,500 ft. This Valley is also known for its flowers. This is the second valley of flowers in North Sikkim after the more famous one at Yumthang.Both the valleys erupt in a riot of colours in the month of May, June & July. Also in the month of Dec & Jan you can play in the snow or even walk across the meandering frozen Chopta River.
From Chopta Valley drive for another 30kms in 1.5hr to Gurudongmar Lake (5225m / 17143ft) close to Tibet Border. This lake is the Second highest lake in India after the Tso Lhamu Lake. If weather permits and permission is availed, proceed for Gurudongmar Lake (17,800 ft).
Gurudongmar Lake is considered as one of the sacred lakes of Sikkim both by the Buddhist and the Hindus. The lake is named after Guru Padmasambhava, the Indian tantric Buddhist who conducted rituals there. The lake remains milky in colour throughout the year and it is believed that Guru Padmasambhava had touched the lake whilst he visited Tibet from this area. Hence, a portion of the lake never freezes.After spending half an hour to one hour there, drive back to Lachen.
After lunch, visit the Lachen Monastery and start your journey to Lachung via Chungthang. Visit the Bhim Nala Waterfalls and reach Lachung by late afternoon.
Lachung is yet another remote high altitude village of Tibetan and Bhutia people in North Sikkim with towering rocky snow peaks, vibrant rhododendron valley, lush green yak pastures, perennial waterfalls and hot springs. This place is the base for exploring alpine valley of Yumthang and Yumesamdong close to the Tibetan plateau.
Evening is free at leisure and overnight stay would be at Lachung.