Go to Quito. Go to the historic, old town center.
1/8s at f/11.0 and ISO 450. Lens set at 35mm or 52mm FF equivalent. Love, love, love my trusty table-top tripod; the cheapest Leica branded item ever! My rule-of-thumb for city nightscapes is 1/8s at f/4 and ISO 400, which barely avoids blowing out streetlights. In this situation, there are extra ambient spotlights on the cathedral, which explains the f/11, but then the dark areas went extra dark. I had to use a left-shifted S-Curve in photoshop curves to bring the street glow to where I wanted it.
Plaza de San Francisco, in the old Market Center of Quito Ecuador at night. The street urchin waved his hands in my lens, until I said "Retira se" in a forceful voice. The historic area is considered somewhat dangerous in terms of pick-pockets, but on this night it was well-occupied by hordes of Quitenos until 9:00 or so. More than normal caution may be warranted, but things are apparently not as bad as in the 1990s.