Dave put together a great trip for Mom and Dad to Europe.  He provided them with book that laid out every step of their journey.  That was pretty cool.  They flew into Prague and then drove to Germany where they spent a few days exploring.  Dave and Ann then met them to go on a Danube River Cruise.  I think they started in Vienna, went down the river to Budapest, and then back to Vienna.  They all had a great time and saw a lot of neat stuff.  They thought the cruise was really nice and kind of high class for them.