Our kids help to spot lobster buoys here in the NorthEast. I tell them they do a great job (and they do), even when the youngest spots a buoy behind us. Keeping them busy and involved helps, and we encourage staying in the cockpit or on deck.
Note that the biggest waves we've seen are 4 to 5 feet, on a 50 foot, 14 ton boat - and that was just once. Usually we sail where it's fairly sheltered, and I avoid beating into waves when the kids are aboard.
I added ginger items to the boat this year. The miniature cans of ginger ale were a big hit. They were stored at kid-level in the galley so the kids could grab them on their own. Ginger cookies were not a big hit - I need to get a better kind and should try the ones you mentioned.
Thanks for the suggestions everyone (especially the one about watering down the ginger ale, Mimsy). Great thread.
Fun fact #2484: In my avatar, that's DavidPM at the helm of my boat.
Bland, non-political statement goes here.