I assumed the original poster had no prior flying experience and so would be approaching the event as an average passenger.

Therefore I suggested the CATIII Autoland off the top of my head as one example to show what these aircraft are capable of, and it is something that your average passenger would probably find "cool". Some people don't even realise the aircraft can do that.

Added to that, its quick to setup and demo, so won't eat up too much time.

Sure I could have said something silly like .... "try a hand-flown wet crosswind landing at limits on one engine with some gusts and windshear thrown in for good measure" or "try your hand at a BA38 style emergency" ..... but if the original poster had no prior flying experience that would be a waste of time, especially if they are only going to have the minimum 15-30 minutes in the sim then wasting time on things they're not capable of without substantial hand-holding by a BA pilot is throwing money down the pan (no point asking the assigned BA pilot to demonstrate it either, because you're only eating into your own time !).