Hi-Tec Sketch Art
You take the Hi-Tec Sketch Art anywhere, with makes it great for traveling or waiting on queues. It uses batteries and it has a USB cable, an AC wall adapter and a car adapter if you will be using it on the move. It will certainly keep the kids occupied on long car trips.
You can create art using a glowing Art wire which outlines shapes in light that glows. If you want to have fun with technology, then this is what you need to get.