Don’t get really drunk or stoned and end up being obnoxious.
Try to be aware of traffic (especially bikes) and of blocking sidewalks/alleys etc. Look both ways on every lane of traffic you cross (including both bike lanes).
Try to branch out your trip from the exact center of the city (or by the train station) and don’t rent an Airbnb inside the city center (they drive up local rents).
If you’re standing on red bricks or red tarmac, you’re probably blocking the bike lane.
If you can’t see the bike lane, it’s likely that you’re standing in it (they aren’t always marked).