In your (town/city, state/province/territory, country, etc.), how would someone travelling to the area offend the locals?

Here (NH) don't be from Massachusetts or NYC. Don't wear any NY Yankees merchandise. Don't be one of those snowboarders that sideslips down a ski slope. Don't play music on a hike, especially in the official wilderness areas. Bring snowshoes on a hike (even if it's spring and 70 at the trailhead, good chances are you will encounter some slush, right now there's snow from just below 3000' up and if you post-hole you go to Hell). And don't put fake maple syrup on your pancakes.