My daughter is an exchange student in Engelskirchen, Germany(Near Koln). My 20 year old son and myself at the last minute were able to get airline tickets to visit her during her spring break April 11-17. We fly into Koln and will spend the day there, go to her host family's that night and spend the 12-13 with them. The three of us will have the 14-16 to explore part of Germany. Funds are tight and I have a son that cannot handle a full tight schedule. Any suggestions?