You can go with the S-Bahn to Munich city. I know that it goes to Hauptbahnhof (Central station), may be there is a better stop..?!
From there you can walk to Marienplatz, Maximillian Strasse, Viktualien Markt.
I like restaurant Nuernberger Bratwurst Gloeckle, next to Marienkirche (cathedral).
Map and tourist attractions here:
http://www.viamichelin.com