For our Parent Nights I generally design a PowerPoint with basic information about the class. I include a rough schedule of the year's (or semester) plan. I also make sure to provide my contact details for parents in case they need to get in touch with me. I usually throw in some interesting PE facts as well, and some fun facts about me!
We have a very similar parent night. We have a power point presentation that goes through our curriculum and expectations. We also have our fitness center open for parents to go through.
In addition to running a power point of activities that we do throughout the year I have also thought about setting up stations consisting of the fitness tests that we perform in class for parents to attempt. I think it would be fun for parents to attempt some of the tests their children do to see how they perform. I think it might lead to enhanced motivation from the students when they take them and can lead to discussions at home pertaining to health/physical fitness.