Munich Airport is Germany’s second busiest airport. It’s a fair distance outside of Munich, so public transportation—either the S1 or the S8—is the recommended way to enter the city. A one-way ticket will cost you just over 10 euros.
Munich has an excellent public transportation system consisting of the U-Bahn, S-Bahn, trams, and buses. If you’re planning a day of sightseeing, purchase a day ticket for unlimited access. Alternatively, you can choose to walk or rent a bicycle (bike rentals are available at Hauptbahnhof, the main train station). Munich is a flat city, and cycling is a very popular mode of transportation.