I did a similar thing to a University here in the UK last year.
It's hard to fill 2 hours!
What is the audience? Is it a surveying course where they will understand the basics of surveying already or are you likely to have to touch upon the fundamentals of co-ordinaate calculation as well?
Don't take for granted the stuff that you do and reasons why you do it. S0me of the basics are what people can find really interesting if conveyed in the right direction.
If you are able to, I suggest breaking the session up.
It sounds like you will be able to have a practical session using a scanner.
1. Introduction to Laser scanning.
This is most likely going to have to be Powerpoint driven. Drop in a bit of a live demo of moving around a point cloud to maintain interest.
Maybe compare traditional methods of measurments to laser scanning. Start with the humble tape measure, through to total stations, GPS and laser scanners.
Include pretty images to get their attention of how cool what you are showing them is (but don't start with the money shot, build up to this).
2. Practical laser scan demonstration. Talk about your thought process of why you position the scanner where you have put it. What method of control is being used and why? What are the other methods of control available and why might you use them?
3. Import and register demo data. All the while, re-inforce the survey principles that are being used.
Key feedback I have received that I would share to help you is as long as you are passionate and knowledgable about the subject, you can't go wrong.