As long as it's not a full-on curb, just hopping the front end up and letting the rear follow should be enough. I will often give a little hop to the front end on my bike going over abrupt bridge joints and such. Still haven't learned how to get the rear up for an actual bunny hop though...

Be careful out there. Kids are a hazard, but adults can be just as bad. I've had to stop hard for adults on bikes coming along the wrong side of the trail around blind corners while chatting with their friend and similar forms of erratic riding.