Keep a few maps in your handbag or car, its great for when 'tweeners (8-12) get bored. The game is that they take turns to look and find a place on the map and the others then have to find it first. It works especially well with Ordanance survey maps of theme parks. My mother always pulled this one out of the bag when we were young, our favorite was the map of Six Flags! Its educational too, as map reading is usually part of the curriculum at some stage. You can take it one stage further and ask them to measure the distance between places with a piece of string and a ruler. They can make their own maps (all of ours love doing this) - or trace one and change it to suit...!
It promises much quiet and allows for full enjoyment of a nice cappucino!!