7.00 am in München, what to do?

We arrive at 7 am at München Bahnhof and like to spend the day in München till we move further. We%26#39;d like to rent bikes, but bike rental only opens at 9 am. Any ideas about what to do in between? We have had breakfast (sort of) in the train

Hope you can give us some ideas.

Best regards,

Liesbeth