For permit extensions you'll need to seek out this distant office around 6km out of the centre.
A desk on the 3rd floor of SBI's main branch will change a range of currencies, but staff are swift to warn you that moneychangers offer better rates (around 5% better), and that's before the all the paperwork, comm…
This is one of relatively few GPOs in India to offer the 'My Stamp' service, where you can get your own photograph turned into a postage stamp (sheet of 12 stamps for ₹300).
Internet access in a slightly grubby upstairs room accessed from the stairway marked Roll House. No wi-fi option. Passport photos ₹50.
Helpful at answering questions and offers a small but surprisingly comprehensive info pamphlet that includes useful schematic maps.
Some of the best exchange rates in Gangtok, and the tea and philosophical conversation come for free from therapist-owner Nukul.
Government hospital with emergency and outpatient facilities. Take a copy of your travel insurance for major treatments.