Photo: GetYourGuideOn a spit of land in the Rheinauhafen, the Chocolate Museum traces five thousand years of chocolate from the Maya and Aztecs to the modern bar, with a working production line and a golden fountain to dip a wafer in. It is a hit with all ages. Book a skip-the-line ticket for busy days, do not miss the chocolate fountain sample, and combine it with a walk along the harbour.