I have visited Munich twice and love the city. I have not been to Berlin but it will be on my next trip. I can offer some things to do in Munich. Munich is close to Fussen, so you could book a trip from Munich to see the castles. The Residenz is an amazing palace within Munich, be sure to visit. Nyphenburg palace is just outside of Munich. If you are interested in art, museums are wonderful. If history is you thing, there are many walking tours you can book. My husband is interested in WWII so we went on a Third Reich tour and also booked a tour of Dachu. If you are interested in German fun, the English Garden is our favorite beer/food venue. Nothing better then drinking a liter of beer and meeting new friends at a table you share with others. The food is outstanding too. Beer is something we enjoy so we went on a beer tour that was both fun and interesting. One thing I highly recommend is Eis. Eis is ice cream that you see everywhere. Stop and have a cone at least twice a day. Nice to cool down after a hectic day of sightseeing.