Although you are required to provide a license and registration if asked, you are not required to answer any of the police officer’s questions nor to submit to field sobriety tests under your Fifth Amendment protections against self-incrimination. You always have a right to request to have a lawyer present before answering any questions from the police (whether you have been charged or not) and the police must stop all questioning at that point.
The police may only detain you long enough to determine whether there are signs of intoxication – slurred speech, the smell of alcohol, open alcohol bottles within plain view, glassy eyes, etc. – such that there would be probable cause to arrest you for DUI. If there are no signs of intoxication or any other crime you might have committed, the police must let you go on your way.