You were a pedestrian when you were stopped? Did you consent (or, at any rate, not refuse) to be breathalyzed?
If you have received an MIP in the past, whether it was discharged and dismissed through completion of a diversion program or not, this current MIP can be charged as a second offense. If you are under the age of 21, an MIP would be the proper charge if you were found with alcohol in your possession.
Were you charged under the East Lansing city ordinance or under the state's minor in possession law? What does it say on your ticket?
It is almost always smartest to plead not guilty at your arraignment and use the time between your first appearance and your next scheduled hearing to consult with an attorney in your area. If you are a student at MSU, there is legal help available through the school, and there are attorneys in the area who offer discount plans or payment plans for students charged with MIPs.
Because a conviction on a misdemeanor charge can affect your life in a lot of ways (including school financial aid packages, insurance and loan rates, travel, employment opportunities), if there is any way to avoid a conviction, you will want to find it. The best way to find a way to avoid a conviction on the misdemeanor is to have an attorney assist in your defense. It is possible that, if you were given a breath test without permission or after permission was denied, the ticket can be dismissed. It depends on the facts.
Seek help from an attorney in your area, in other words, for the best outcome.
Good luck.