Which would be the best train ticket?

Hi,

Arriving in Munich airport on Wednesday for the AUDI cup and flying home on Friday, can someone advise what would be the best train ticket to purchase so that i can get from the airport into the city, to the football ground and back Wednesday and Thursday and then back to the airport - is there a multi use/multi day type of ticket avialable i should purchase at the airport on arrival?

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Munich airport to Munich city (We, Fr):

Single ticket is EUR 9,20.

Day ticket is EUR 10,00.

Just the city of Munich (Th):

Day ticket is EUR 5,00.