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
For those slightly more advanced..
OR find a code club in your area. codeclub.nz
Or book a gather workshop for your school
We get our robots from mindkits.co.nz
Start a VexRobotics team at your school.. http://www.kiwibots.co.nz/