As an alternative to the S-Bahn I can recommend the Lufthansa Airportbus:
http://www.lufthansa-airportbus.de/
I am not sure if and when it will be running on the easter weekend, but I guess the normal schedule (every 20 min) should apply. You can either board at the Hauptbahnhof (Mainstation) or at München Schwabing Nord (probably your choice if you live in Schwabing, Arabella Sheraton or the Hilton's).
Have a great time in MUC!
Btw. If you haven't been to Munich Airport.. it is a breeze ^