If you'd love to add a bit of extra culture to your trip, put Namgyal Institute of Tibetology on your must-visit list. Check if there are any guided tours or just browse around at your own pace.
This Gangtok museum is an interesting place to begin your day of sightseeing. There's loads to see and do in the area, including MG Marg Market, Rumtek Monastery, and Tashi View Point. Take your time at Namgyal Institute of Tibetology before hitting up these other fine sights.