Hmmm. Sounds like you have a great opportunity there to introduce some kids to sailing. Schedule some youth sailing days, make up flyers and distribute throughout the neighborhood.

Instead of telling kids to get off your boats, ask them if they want to go sailing with you.

I know, too idealistic; right? But most people are LOOKING for kids to go sailing. If you have them actually lounging on your boats, don't chase them away -- grab 'em and get them out on the water.