Bayern Ticket (DB)

The ticket offers you unlimited travel on all regional (including MVV) and suburban trains of DB Bahn within Bavaria for one day (1 person:  27€ + 9€ per additional traveller; max. travellers: 5). From Monday through Friday, the ticket is valid from 9 am to 3 am the following morning. On weekends and public holidays, the validity time starts at midnight (12 am).

Bayerische Regiobahn (German only)

With the BRB you can travel to some of the most beautiful destinations in Bavaria. Here you can find a booklet with further information in several languages as well as some suggestions for nice trips. 

Regio-Ticket Werdenfels (German version only - DB)

Explore the Werdenfelser Land (includes Garmisch-Partenkirchen) with the Regio-Ticket Werdenfels.
The daily tickets are also valid in the MVV area (S-Bahn/suburban trains).
Single ticket 24€/day; max. 5 travellers (+ 9,00€/additional traveller)
Every day from 0 am to 3 am the following morning.