Bring your boat - if space allows. Bring as much equipment as possible. One note on equipment - be CAREFUL that people don't pick it up and hurt themselves or others around them if you're talking to someone else. We had a 2x4 with drilled holes that allowed for smaller arrow shafts with different tips to sit in.
We've done powerpoints and that works really well. Like Brady said - people are drawn to big fish pictures. Make sure the pictures are cleaned up and not all bloody. Bloody pics may turn some people off to the sport. When we did our powerpoint we had saltwater fish and freshwater, along with bullfrogs, snapping turtles, etc pictures. We also did a basics of boats, raised/flush decks, bows, reels, rests, arrows, points, etc. Make sure that your know your states laws as to what is legal to shoot in your state. Brochures or websites to any local clubs in your area is good to have as well.
If you want people to actually "try it" - if there's a body of water near by, put out some pop bottles/milk jugs and let them shoot them from the shore, dock, etc. I think I've seen pictures that people had a stock tank that kids could shoot at a target in. ???