One word: Huge. But to add to that, we first carefully screen our leaders and volunteers. Next, we spend serious money on the finest children's program we could find- "252" which was developed and used by Northpoint Church, pastored by Andy Stanley. The quality of Biblical content and creativity is second to none. We have roomy children's center called Base Camp, where kids have space and technology to worship and learn in a hand's on environment.
Our middle and high school students are ministered to the same way, with opportunities for group-building acitivities like rafting and student conferences with the finest communicators of the Word and live worship.