We are thinking of driving to Germnay for end of May half term. We are planning to drive to Munich and thought we would spend the first two nights part way. My husband would like to go to Frankfurt but I thought Mainz might be a better option. We have a 15 year old and a 12 year old. We will be staying in Cologne on the way back, so wanted to go somewhere different on the way out. Could anyone offer advice?