I had the most incredible experience at Fermi Lab, the national accelerator located in Batavia, Illinois about an hour north west of Steger. I strongly encourage parents and students to visit the website as well as the research grounds that are part of Fermi Lab. You don't have to be a scientist, a teacher, or even someone who likes science to enjoy the site. You can watch the buffalo roam; go fishing; bike through the grounds and around the accelerator; view the sculptures; enjoy nature; become a human sundial....all without even entering a science building!!
www.fnal.gov/pub/visiting/index.html