Chaos Canyon is a kid's area just below Mid-Vail that has several different options.
There are tree lines to the left of Thunder and Tornado Alley with nice lines and small bumps.
The Ricochet has small rolls for the kids to get small air.
This is a safe place to let them learn how to negotiate trees or bumps and they will love it since it's catered for them.
Kids will enjoy this more than the adults as so many have gone through here that it's better for their smaller skis or boards than your larger ones.