After breakfast this morning, you will be taken for a day excursion to the oval-shaped Tsomgo Lake, which is 40 km from Gangtok and situated at a height of 3,780 m above sea level. It is also the home to Brahminy duck and several other migratory birds. Post this, Travel to Baba Mandir another 17 km beyond Tsomgo lake and dedicated to the war hero, Baba Harbhajan Singh. Next, visit second highest mountain pass, Nathula Pass which is an open trade Indo-China Border(permit cost included,transport cost to be paid on the spot). Return to Gangtok be evening. Overnight at hotel. Note: Nathula Pass is closed on Monday & Tuesday. If your days are clashing, we can provide alternate sightseeing.