Heres some interesting things you can get your kids doing..
For Beginners -
Scratch - scratch.mit.edu
Hour of Code - code.org/learn
Tynker - tynker.com
Head to your local e-waste business and start pulling stuff apart! We use computerrecycling.co.nz
Remember to take out any batteries and cut of any power cables and have adult supervision.
For those slightly more advanced..
OR find a code club in your area. codeclub.nz
We get our robots from mindkits.co.nz
Start a VexRobotics team at your school.. http://www.kiwibots.co.nz/