How you can pick a Tourist

You are carrying a map of the city and constantly stopping at corners or in the middle of the street/path/crossing to refer to it.

You have a large camera bag slung over your shoulder

Asking for the cheapest train tickets and day tripper prices at the train station

You take photos of buildings

You ride on a irridecent bright orange double-decker bus with the words 'City Sights and Tours' emblazoned on the sides

Getting boxes of Krispy Kreme donuts at the airport to take home.

And finally the most obvious giveaway:

You go to the local Chinatown BBQ House, order 4.5 kg of chinese pork/liver sausages and 2 large, WHOLE and UNCUT Roast Ducks.