Mitchell Field is between The University of Michigan Hospital and North Campus.
The easiest way to get there from a highway is to get off at the Geddes Road exit on US-23, which is also the least busy Ann Arbor exit on a football Saturday. Take Geddes Road West. Geddes becomes Fuller Rd. after crossing Huron Parkway near the highschool. Stay on Fuller past the VA hospital on the left, you'll see the field on the left before you pass the big hospital. You will have traveled about 2 miles from the Geddes Rd exit on US-23.