Germany for 2.5 weeks, staying in Frankfurt, other cities to visit?

Hi! I will be staying in Germany for 2,5 weeks. I will be located in Frankfurt, but I considered going to other cities as well. Can anyone help me with some information? I would really hate to miss some nice thing because of my lack of knowledge about Germany. Thanks in advance.

It is great you will be staying in Germany for so long. There surely are great cities to visit. Besides Frankfurt, you should go to Berlin. There are fantastic museums, but also clubbing and nightlife there. You surely will not regret going there. Then, go to Leipzig. That is the city of music and history. Go to Bach museum there, go to several galleries, see the beautiful and clean city. After the visit there, go to Cologne. There you will have an opportunity of going to the Chocolate Museum for an unforgettable experience and witnessing of the process of making a chocolate. The last, but by far not the least, go to Munich. Little painted houses there, city that looks like it is brought from some fairy-tale, nice people, and many shops and stores where you can buy some of the local specialties in which you will certainly enjoy. This is my suggestion, and if you go to any of these cities you will not regret.