There is an excellent opportunity for parents living in Belgium (or anywhere that is not far from Cologne, Germany) that presents itself every two years: German Aerospace Day. The latest event took place last year, and unfortunately our son was just a few months old then. Thus I decided to take a field trip and get familiar with the environment, so that maybe next time (or four years later) I can take him to this wonderfully exciting event in which a child can ask questions directly to the astronauts or walk inside the 1:1 scaled of International Space Station‘s Columbus module. And then maybe go through the initial procedures of applying for being an astronaut. On the more adventurous side, he can join the other children and build rockets, and then test them in real-time (Well, I’m sure some parents will have at least as much as their children, if not more.)
See http://www.flickr.com/photos/64416865@N00/sets/72157627707338780/with/6163815118/ for more photos.