Need help for fishing presentation for kids!

[fishin' fool]

At the state park I work at I was asked to do a presentation for our free camping weekend in Iowa. So of course I choose fish and fishing! The audience level is open to anyone, but I expect mostly kids and young adults. Since this is my first presentation to the public I'm kinda stuck on ideas. As of now I plan to do: live fish identification, conservation of fish and fish, tools and equipment, and to end the presentation by having them take part in fishing along the lake.
For the conservation of fish and fishing I'm planning on talking about handling fish, removing/cuting hooks that are deep in the mouth, why we have length and bags limits, pinching barbs down or using barbless hooks (I do when fishing for bluegill), and just basic care for of litter, water quality and fish in general. Is there anything I'm missing here, or you guys and gals think is important that I should talk/teach about?? Im really stuck on ideas and I'm giving the presentation this saturday!!
Thanks and good fishin