We will be in Karlsruhe in early July for work and would like to extend our stay for 3-4 days for a short vacation. I'm considering a spa at Baden-Baden but could also be interested in another vacation destination. I haven't purchased air tickets yet so it is possible to fly from Frankfurt or Stuttgart to a fairly close vacation spot and then book my return flight from there. (For example, if a budget airline offered good one way rates from FRA or STR to a coastal area in Spain, France, etc.) Doe anyone have suggestions for a close to Karlsruhe vacation spot or somewhere easy to get to from Karlsruhe by air?