Meet shared taxi or pre-booked private car for the 4–5 hour drive to Gangtok; this gets you into Sikkim with good time to settle in. Roads can be winding so plan for stops en route.
Shared jeep or tour departs early; Tsomgo Lake is at high altitude and typically visited 9:00–16:00 — permits processed through Gangtok tourism office prior to departure.
Glacial lake set among alpine slopes — very scenic and accessible for photos; lake area typically open 9:00–16:00, check permits and weather first.