Answer basic questions though like your name. Not sure if you need to give your address but it would have limited harm towards you.

When they begin to ask questions about what were you doing, or where you were going, you can kindly decline by saying I'm not going to answer any other questions.

If things do get worse for you showing that you were cooperating with the police by showing ID and giving your name only benefits you and answering nothing else is completely in your favor. Even if you're being questioned as a witness you don't need to answer questions with ones that could be incriminating to yourself. Don't self incriminate.