Oshtemo for sure. Its still a challenge for me so i like to play it. However, we also have Robert Morris, Coldbrook, Knollwood, and Meyer Broadway (in three rivers). Meyer Broadway is a great course and you should play if you ever get the chance. They added in a whole new course in the back of it for worlds last year.
Welcome to the site Noel. This is a great place to meet disc golfers from all around your area....kinda like me! I'm from Kalamazoo so i'm just a short ride away. You ever been down to golf in the Zoo? We have some great courses. Well...enjoy DGRUS!