Answer:
1. If you're walking somewhere, walk on the RIGHT side, NOT the left (If you're American :) If you're not American and it's normal for you to drive on the left side, then please also walk on the left side)
2. Don't chuck your trash at the tree. If you have trash, put it in a trashcan. If you see trash, put it in a trashcan.
3. If you're going to use profanity, do it quietly, please. It makes the rest of us uncomfortable.
4. When wearing earbuds or headphones, make sure that other peeps can't hear it.
5. SUPER SIMPLE but SOME brains can't get this: just be overall respectful to others. You don't know them or their situation, so leave them be.
6. Last one and it's small. Hold open doors for people right behind you. Don't pull a sneaky ninja right before the door closes and make the other person open the door.