ok, i'll be the contrarian on this one...
it's no danny mcaskill video, but it's not bad. it's kids having a good time on bikes, which is what bikes are about.
you sound like old curmudgeonly people not understanding why "kids are riding those dumb contraptions."
you complain he is riding on "walk only" trails and then bust on him for walking.
i walk up hills all the time. nothing wrong with that.
his bike isn't hurting the trail. he wasn't hitting walkers. he was having fun.
so he doesn't wear a helmet. growing up i never wore a helmet and we did jumps in the woods. the kid isn't doing super D without a helmet, he isn't doing any huge airs. yeah, there are trees near by, but it doesn't look all that deadly.
seriously. you all need to lighten up. the kid on the bike is having fun, not destroying land, not hurting anyone, he is doing what you are supposed to do on a bike.
rock on kid.