The most striking new addition to the ESO campus is the Supernova planetarium and visitor centre. Entry is free, but the building is closed on Mondays and Tuesdays. Entry to the planetarium costs 5 Euros, and bookings in advance are advisable. Note that although the shows also have an English soundtrack, on some days only the German versions may be playing.
Garching town centre is well-connected to central Munich by the U-bahn train. The final stop after Garching is the Technische Universitat Munchen (TUM) campus where the ESO headquarters are located. ESO is a pleasant 25 minute stroll through the Bavarian countryside from Garching town centre. Although there are a number of hotels in Garching, those spending more than a few days there may prefer to stay at the Soulmade, which offers Quest-style serviced apartments with kitchenette.
The Bavarian alps are just a 2 hour train ride away. While many tourists head to the town of Fussen to see the famous Disney-esque castles, the cable car up Tegelberg provides a spectacular view of the surrounding alps and countryside. The walk back down can be tough on the knees!
ESO welcomes short- and long-term scientific visitors, and there are seminars, colloquia, and journal clubs on most days of the week, including in the adjacent Max Planck Institute for Astrophysics, or on the main TUM campus. You're bound to run into people you know and work with, and it's a great way to promote the exciting work being carried out with ESO and Australian facilities.