Amsterdam is a very popular destination for tourist visits. Mostly you can guess where they come from, although the differences in people are fading as everyone seems to wear the same clothes all over the world now. This must be a group from China I think.
The man with the briefcase doesn't look touristic at all, more like an office man, maybe he is the tourleader.
And the characters" Iamsterdam" are always very inviting for a photo.