The largest German cities generally use only one letter as the city code on their license plates. For example, B=Berlin, M=Munich (München), K=Cologne (Köln), F=Frankfurt, L=Leipzig, and S=Stuttgart. Although Hamburg is Germany's second largest city, H is used by Hanover and Hamburg instead uses HH as a reference to its earlier membership in the Hanseatic League (German: Hansestadt Hamburg).
My coworker Jamie also came on this trip and he brought his family. In the evenings, we visited a fair at the Hamburger Dom and I got a chance to go to the harbor and take some photos.