I arrive, coincidentally, just as the city's annual rollicking beer festival begins. Also, I have an appointment with a chocolate maker. Also, I eat snails from an escargot stand on the street.
Could this be Brussels, known as the tedious capital of the amazingly dull European Union?
Obviously, somebody has been keeping this place a secret.
"Does this happen every day?" I ask an art shop owner, pointing to the white beer tents and thousands of grinning Belgians spilling across the enormous expanse of the Grand Place (Grote Markt) square.
What do I know? Maybe it's a daily thing. Something to keep up their spirits in a gloomy world.
"No, it's a festival," she says, rolling her eyes. "With a parade at 2 o'clock."
Sure enough, pretty soon a brass band, costumed harlequin actors, beer wagons and draft horses come clomping down the street. The sun glints off all the gold on the 15th-century Hotel de Ville. People shout and clap. Men in red hats hold up steins of beer, singing.
It turns out that Brussels is a festival town, celebrating art in May, culture in June, flowers in August and beer in September. Tourists who time it right can not only partake in the fun, they can meet actual smiling Belgians.