Recently, I went to Germany. With the 9 Euro ticket you can board all regional trains in June, July and August.
You find out more in these links:
I travelled through Germany to see my family. I went to Berlin, Cologne and Westphalia. On the way back to the UK I met another German lady who did the same.
It was a great opportunity.
I had a wonderful time. Now there are lifting most corona restrictions in Germany. However, you still have to wear a fpp2 face mask on public transport.
Germany has beautiful mountain tops in the South and the seaside in the North. You can see it all at your leisure.