For those of you who don't have experience in touring, let me give you a pretty brief summary of the kinds of things that often happen for Robotics tours to "VIPs" or outsiders (based on experience at Boilermaker Regional).
You really don't have to be a genius to do this. The idea is that you give the people you are walking with (sometimes a tiny group, other times 8 or 9 people, it varies) a taste of what FIRST is, and especially how it has affected you. The reason that competitions like IRI & BMR do these tours instead of just showing visitors an informative video is to add the personal touch, the individual flavor and passion of the students who participate in the competition.
I promise it's fun...give it a try.