I'm an 18-year-old getting ready to travel to Switzerland and Benelux with my 21- and 23-year-old siblings in late-May/early-June. We're flying into Zurich and out of Amsterdam and will be in Europe for 11 days (including travel). We'd like to visit Bastogne, Brussels, Bruges and Amsterdam, but we're totally flexible about how we do it -- with the exception that it has to be pretty cheap!
Any suggestions? We're all pretty much up for anything!