All of it, all of it - all the seven sisters and Sikkim. Each state is unique with it's own culture and exotic places like the biggest floating lake in the world in Manipur for instance. the North East remains relatively unexplored and I wish that it would remain so, for at least that way the pristine and unspoilt beauty of the place will remain for others to experience. My sincere request will be to respect the culture of the people there and be environmentally conscious.
It comprises of eight states, you can almost spend whole year in exploring the places. You gotta be specific which state would you want to visit. Basis which people will be able to tell you where to visit