premise: Sitting in a Saigon streetside cafe you can enjoy steaming noodles , while just down the road , cyclo drivers -- relics of yesteryear -- badger and bark at each other over a game of checkers , only to look up , catch your eye , and break out into that amazing Vietnamese smile . Open to foreign tourists for well over a decade , Vietnam has rapidly developed a well - trodden trail of tourist attractions . In the north , hanoi charms , while the vistas of Ha Long Bay and the hilltribes of Sapa draw tourists in their thousands . In the centre of Vietnam the remnants of the war can still be seen around the DMZ , the Imperial capital of Hue offers a glimpse into yesteryear and the incredibly popular Hoi An attracts shoppers in their droves . Why do the vietnamese people have such a wonderful smile ?
hypothesis: They are accustomed to seeing tourists in their cities and repay that with a friendly smile in order to be welcoming