i don't know if they still let you do it.
but, back in the day, you could walk through the rideau centre from rideau street up to the mackenzie-king bridge in the middle of the night. she lived in the elgin area, so we'd often come out of a bar in the market after last call and walk back to her place through the rideau centre.
and, one night, around christmas, we made a detour into the santa claus area, around 3:00 or so...
like i say: this was all her. i'd never think to do something lie that.