1. Do not make any unsolicited statements; there is nothing you can say that will make things better.
2. Be polite and comply with requests by law enforcement. Being polite does not mean making a statement, if law enforcement asks you about the event politely tell the officer that you will gladly answer questions once you have had the opportunity to speak with an attorney.
3. Do not fight with the police, I have seen more minor misdemeanors turn into felonies by people that struggle with the police.