Lst april I Also travelled sikkim with two of my colleagues.
Its only to say heaven to the north sikkim.
I visited East sikkim , west sikkim and north sikkim . North sikkim was jst amazing , what u will get to see you can't imagine also , its like only heaven.
Sikkim - North and East Sikkim must
Meghalaya - Cherrapunji, Root bridge, Dawki river Transportation only thru cabs in respective state.. From Sikkim to Meghalaya take a flight from Bagdogra to Guwahati and a cab to Shillong.. take good winter clothes